Like other reviews say, leave all your previous hangups about Behringer at the door, they have really changed their game with the X32 line of products. The build quality is excellent: the dials, sliders and buttons seem very hard wearing. Once you get the whole feel about the flexible mix bus workflow this desk uses (and a lot of higher-end digital consoles use), it is an absolute joy to use.
The preamps are absolutely worlds apart from Behringer's previous offerings, big and bold sounding without going dull. They have a tendency to start to sound a little thin if you need to crank the gain, but I've been assured this is a typical quirk of Midas designed preamps. Digital scribble-strips at this price point is just plain unheard of!
Bought this with two S16 digital snake modules, effectively doubling the analogue I/O. I silly cannot believe that this system was purchased for relatively little money and the quality is retained. Fantastic. If Behringer can shake off their historical 'cheap&nasty' stigma, this will be the product line that completely obliterates the competition at this price range, although it's doing a pretty good job already.
Oh, and be very careful with the latched XLR inputs on the X32 and S16s. There have been reports of XLR connectors (with the little latch 'window') getting stuck in there. I have had other equipment suffer this issue and I have avoided this by using Switchcraft or Neutrik XX series XLR connectors (or ones without the 'window').