I just bought a 3620 last night and I used it right away, and it's absolutely fantastic. I have no idea what "dmitche3" is talking about, the setup was super easy, Wifi from 3 rooms over was detected perfectly, Wifi printing both from AirPrint via iPhone and from PC worked like a charm, double-sided print worked perfectly, and text quality is fantastic for an inkjet (still not laser quality), and print speed is the fasted I've tried.
Setup was literally done in minutes, and after I downloaded the driver/tool package from Epson it not only installed everything, it automatically updated the firmware and pushed it into the Printer, super easy (can't say the same about Canon)! The touchscreen and usability was also very useful and easy to use.
I also printed some photos on Epson Premium paper and they turned out great. I'd say not lab quality but quite close. They say Ultra Premium Paper will yield better results, so might try that later.
I cannot comment on Ink cost yet, but just like any inkjet must go for XL size of ink to get any decent cost.
Overall, I think it's a great little printer (3620), and I highly recommend it for an under $200 printer, and if you get it on sale below $150 (like I did), it's a bargain.