Behringer is low end, I would not want to rely on one for mixing a big live concert or live broadcast, but for home use they seem fine.
I've used Behringer for years in the home production studio and never had an issue, it works like a charm. I don't think larger studios or live venues ever were the market Behringer shoots for; the home/small studio stuff is what they have always aimed at.
If I were going to mix down a whole boatload of inputs (ie large studio or live venue) I'd definitely go for something that is aimed specifically at that market. If I were going to outfit a studio these days I'd be hard pressed; on one hand an old analog model from SSL, Neve or API would be nice, but there are so many nice digital consoles out there these days it would be tough to decide. I suppose it sort of goes along with that old "tube vs solid state" argument for mike preamps.
I have been thinking about replacing my faithful Behringer; there are so many slick home/small studio options available for very attractive prices these days (some of which use your iPad as the control surface) that I'll have to put some serious research into it.
And back on topic. . . if I were looking to mix my scanners down into a small speaker, I'd probably go with the line-level audio from the scanners and build my own mixer with some simple buffer amps and potentiometers, then run the output to a good amplified speaker. That way I could customize the whole thing to suit my needs.