What Danny said is all accurate from my vantage point as well.
My reason for the Behringer's was ease of use. Even when hiring an electrician, it was just all around cheaper and easier for us.
I did build the TriTrix, and I do really like them. The flat-pack kits from Parts Express (currently out of stock) are really easy to build, in my opinion. Very reasonably priced for the performance. I have a pair of them that I built for this and I keep them on my desk at work - love them. They aren't quite as capable as the Behringer's - a little less powerful. Depending on your situation, this may not be an issue. If you're up for building them entirely yourself (which, by the way, I am considering doing out of solid Walnut in the near future), you can get the build plans here:
http://www.speakerdesignworks.com/Tritrix_pg_3.htmlFactoring in the cost of
good amplification is what tipped the scales in favor of the Behringers. In my case, buying 56 channels of amplification was going to be astronomical in terms of cost, AND real estate. Having that many extra amps in a rack, taking up space, which even then would have required specific power considerations.
So in the end, I just had the electrician run the 48 main Behringer's on 6 circuits - 8 speakers on each circuit - and to turn them on/off I just flip the breakers in the dedicated breaker box. It's not a "one button" organ startup by any means but it's not rocket science either. Since I'm not a licensed electrician, I felt I should leave the high voltage to the "pro" simply due to liability. If it were my own HOME, I'd have done it myself. I did, however, work out a deal with him. I pulled all of his wire (MC cable) for him and mounted all of his J-Boxes. This means all he had to do was the actual connections. This made his job MUCH easier and therefore cheaper. It also meant I controlled everything - I put the J-Boxes where **I** wanted the receptacles to go. I ran his MC cable in a totally different pathway than the audio signal cables. Even when you ask nicely, people will try to take short cuts. This way, I made sure all of the high voltage and low voltage cables are completely isolated - and it greatly reduced the cost because it took the majority of the physical work (and all of the 2-man work) out of the equation and saved us a lot of $$$.