I have a TC BAM200 stuck to my pedalboard that I use for practicing at home.
The fan is whisper quiet; similar to a macbook. In my soundproofed room I only really hear it at all when everything else is turned off. Can't imagine it being remotely intrusive while actually playing.
For reference, before I bought the BAM, I read reviews where people had said they 'hadn't pushed it hard enough for the fan to run'. However, I learned after buying mine that the fan actually runs all the time so I guess the reviewers hadn't heard it at all!
I can't compare to the others I'm afraid. I've used an Elf but only in a noisy environment.
