Using switches also, but very few, so cannot really comment on those.
Two CSS326. Both “modded” with two fans: one on the rear for air intake and one internal, blowing down on S+RJ10 modules. No problems with them besides crazy SPF+ modules temperatures.
Two RB260GSP. One crashed and had to netinstall. Worked fine after. One was just decommissioned while still working fine.
Small issue with RB260GSP was that it could not power even a small Cisco SPA VoIP phone, so I had to purchase external power bricks.
later edit: correction about about RB260GSP, was in fact RB960PGS used as switch.