Sorry Dave, I don't think I made myself clear on that comment. I was referring more to the OP's DSP issue, althought the behringer unit was known for some models having the crackling issue, overall reliability seems good so far, as in I haven't seen any stories of outright failure.
My point was, taking into account this information and comparative pricing of the units, the chance of 2 behringers failing compared to one driverack pa must surely be much lower.
Not that either unit seems unreliable so far, I simply believe that although people are still very sceptical of a behringer product (or any product that is priced less than half of competing products), they seem to get the job done.
As far as amps go, yeah I'll happily concede on that point, if its amp failure that brings down a gig I'd be more sympathetic to the provider if they were world reknowned brand such as QSC, Crown, LAB etc.
Sorry for any confusion!