FINALLY: RELIABLE NON-OEM CARTRIDGES HAVE BECOME AVAILABLE AT A 25% DISCOUNT. CIAJIE cartridges are made with exceptional care, almost equalling Canon originals. YOYO cartridges (which I've just ordered) are slightly higher in price, but if purchased on a subscription basis, can be obtained for an additional 15% discount.I was ready to give up on this, my 3rd MG3520 (the first two were black and red, respectively). But suddenly decent "clone" cartridges are available through Amazon Prime. I installed a pair made by CIAJIE and instantly my machine recognized them and sprang back to its old reliable self. For around $50 its mind-boggling trying to come to an understanding of Canon's profit margin after the manufacture of a machine as complex as this. Well, of course, now we know. Without a steady stream of dependable profits from ink sales, Canon--which has had to forfeit much of its camera business to Smart Phones--would not be able to stay in business. (If you appreciate old-fashioned devices like Canon's line of high def cameras, just check out the close-out prices on the Canon site as well as some great used deals on Amazon. The only item I could not be persuaded to buy "used" is a printer. Admittedly, they're delicate yet comparatively durable if the user treats them well. Bad ink rarely brings them harm, but if the ink comes in non-Canon cartridges, the slightest misalignment could put your machine out of commission for good. (Which is no tragedy with the MG3520, thanks to prices that barely equal cost of manufacture.)6/15 I've been through at least 8 printers in the last 15 years. It's rare to get 2 years worth of service out of most "home office" printers (making me suspect I've gone through a dozen). At under $50 this printer is a no-brainer purchase, a gift from Amazon (look at the higher prices of the other merchants for the same machine--or even the higher prices for the same machine in a different color, esp. red). Above all, look at the price of cartridges -- a single pair will cost you the price of a machine. Few of those other low-priced, lightweight non-Canon machines offer extras like wireless and duplex printing. Moreover, the 3520 has executed both wireless and duplex without a hitch. My previous machines promised wireless, but I soon gave up on them and settled on a 20-foot cable awkwardly strung behind my desk. To my surprise, Canon appears to have gotten it right with the MG3520. Except for the scarcity of cheap "cloned" cartridges, the machine has risen to the top of the printers I've used since getting my first some 25 years ago. It's the most durable machine, performing flawlessly while delivering on the extras (duplex printing, wireless printing). I can print from my bedroom from across the house and even from my phone while outside in the front yard. My only complaints have been due to erratic performance (not being able to read remaining ink supply, etc.) as a result of using some of the non-Canon "cloned" cartridges.I went to Canon printers after problems, first, with Epson and, 2nd, HP. Still, compared to the sporadic wireless performance of my previous Canons (including an MX Office Model), this is the first Canon that has given me no cause to go to a cable. By ignoring the Blue Tooth feature and using Apple Airplay and Airprint, I'm finally able to depend on flawless wireless connectivity from an iMac or from a Mac Air notebook from the other end of the house. But the primary reason I stay with Canon is the Duplex Printing feature (notice how few new devices include hard-copy instruction manuals. Who wants to print out a 180-page manual when, with this printer, it can be printed out as a 90-page manual?)How is Canon/Amazon able to sell the printer at a price so low that disposal and replacement would be cheaper than repair of the machine?The answer, I'm convinced, is the ink. At $50 for the box of 2 OEM cartridges, it's almost as feasible to order a new machine (which comes with 2 cartridges) than to order the cartridges. Since ordering the machine in Sept. '13 I've had no problems (or "challenges") other than feeding it sufficient ink for continuous, day-to-day performance. Canon 2-cartridge system is definitely less economical than its former 4-5 cartridge system (still available on some machines). And if you plan to save money by purchasing clone cartridges, don't get your hopes up. They appear to be manufactured by Canon (or under the company's close surveillance). Moreover, the clones don't have accurate read-outs of remaining ink supply and can "fool" the machine into quitting even though ample ink remains. (Google the solution on the internet. Basically, it's a matter of disconnecting the machine from AC for several seconds, than restarting, then pressing down hard on Black or Color or both for 30 seconds. Then enjoying the remaining ink supply without depending upon an accurate reading of remaining ink supply.)It's also probably a good idea to take note of the two different kinds of "black" that Canon uses--one is specially made for printing text; the other is a dye that's made for printing photos. When the black ink for text runs out, the machine can be switched over to color, providing text that is faded or slightly reddish, but it's strictly an emergency work-around--not the text quality you'd want on a resume.The machine is also a handy "copy machine," which I use frequently for music. And I honestly don't miss the monitoring, or viewing, screens that were on my pricier Canons.. I guess if you plan to edit photos with your printer, the screens could be useful. Since the only editing I do is in iPhoto, the lack of a screen on the MG3520 is a non-issue. Also, I can't comment on Canon's software for scanning editable text into a computer--something I've yet to try. (I'd be both surprised and disappointed if it wasn't better than the scanner-translators I tried using 10 years ago.)