We are running CTs and they are stable. They like it cold though (including through that side fan that cools the power supply). We have had great support from timo and his crew. Each new firmware seemed to help. KNC and Spondoolies also run very steady in a racked environment.
agree about the CTs liking the cold! I haven't bought enough from CT to rank that level of support from Timo I guess

...haven't needed much though either. I have not had a great sales experience with CT which is disappointing given Ravi's background in mature corporate environments.
Do they really expect someone to just hit the buy button for 525 chips or 50 boxes without even a conversation?