My thing with CHE is lack of easy access to them (replacements) at the store. I try to always have spares of stuff but in the end I tend to use things that are easy to replace, rather then waiting for shipment. With CHE's initially it was also cost which some of our members here have already pointed me to where I can get them less ridiculously priced.
The good thing about CHEs is that they seldom burn out. I have one that is still in use right now that I've been using continuously since 1991 when I got my first sulcata. The only time a CHE has ever stopped working for me is when I dropped one once, and there was one that I broke off of its screw in base by being impulsive and using gorilla tactics on it. I have over 20 of them and not one has ever burned out or stopped working.