I have an EcoTank and print infrequently, clogging has never been an issue. I once didn't print in half a year and it didn't clog.

Printing quality goes down after not printing for a long time, but the automated "cleaning" (or whatever it's called) program solves that in a minute

I've never had a clog with my color one. The shop my wife works at (which I get occasionally called on to do tech support for) chose the B&W model for their invoice printing and they've been using it heavily for about three years now with no problems.

I have an ECOTank and haven't had troubles with clogs. The Windows driver has been a bit buggy, but Mac has been solid.