the jb3 is as stable as the signal you're sending it. do NOT get a co2.
quite true! definantly feed it an optical output from your gear, or use the hose box for coax/aes > optical
i used one for quite some time, and never had one single problem.
one time in particulor, i used the jb3 (plugged in, not on the internal batts) for a small local festival. i recorded 10 bands that played at least an hour, more of them played 1.5 hrs. this was in july, 100 degree heat, plus high illinois humidity, direct sunlight. and the thing functioned without a glitch one. that is about as much of a test as you can put a piece of gear on i would say!
buy one, you wont be dissapointed!