To be honest with you. I had a Behringer m2004 mixer, it worked fine for me. But, after reading on this BBS, I got brain-washed, and switched to a Mackie 1402.
The only differences I have noticed (with my very limited experience in recording) were:
1) Mackie costed me more
2) Both boards' preamps are pretty quiet, but the B's pre gets pretty noisy if you turn the gain over 2-3 o'clock. On the other hand, Mackie's pres stay pretty damn quiet even turned all the way up.
So, in my opinion, you can easily get away with a Behringer board for live use. But, I can't asure you how long that baby will last tho...the Mackie "looks" stronger to me (maybe just the color that did the trick)
Al