I love my 7900. It gets a clogged channel if I let it sit more than three or four days without use. So I have to do a simple 2-channel nozzle clean to clear it -- takes maybe 3 minutes and burns a few ml of ink. If I let it sit a few weeks, then I get usually two clogged channels and have to do an all-channel clean. This takes 5 or 6 minutes and burns a bigger few ml of ink. If I've let it sit a month, I may need to repeat the full clean a second time to get everything flowing. Yes, that's a PITA but...
I *LOVE* the print quality. Great sharpness, color, saturation, linearity and repeatability across a variety of stocks. I love the output so much that I'll gladly put up with having to clean before each major print job. I get the best WYG after my WYSI that I've ever gotten. I love it so much I have not even considered other options. In fact, I am so pleased overall that if my 7900 were stolen tomorrow, I would have another on order inside an hour. But maybe the 9900 instead
Now re the 4900. The only potential negative issue I have, is the pizza wheel thing -- if that is a reality on the 4900 then it's a shame. And more shame on Epson for not addressing it...