I had a CECHG once, I didn't like it because it had the Uncharted 2 turbo fan problem. Sounded like a hair dryer after 5 - 15 minutes of playing that particular game. No idea what temperatures it was hitting, as this was way before we had temperature sensor reading homebrew. YLOD is probably the main concern but you could say that's a concern for any fat PS3 really.
CECHG is the last PS3 model released with NANDs (SEM-001 board).
Personally, I would avoid this model.