Aamefford, nice setup. That amp looks quite familiar.
For those on the fence, just buy and try it. You can return it minus the shipping if you don't like it. I've done this once. $10 increase in quite small now a days - 2 gallons of gas now a days. As a former owner of the TTVJ slim, PICO, and my most missed amp - TTVJ Millet Portable Hybrid (sorry, had to add this), I can say with confidence, that to my ears and wallet, they will tell you the UHA-4 holds its own very well to the amps costing 2-3x without the extra crossfeed feature. I have observed, in general, three audiences: 1) The budget conscientious; 2) The intermediate budgeteer (will pay for the higher end, but only used or deeply discounted - which is me); 3) Higher end, Damn it, I got to have it, and/or be the first in line to audition (high end FOTM purchasers as an example). So, what's the point?
Well, the UHA-4 amp can satisfy any audience. Buy it and try it, or return it - simple as that. IMO, we shouldn't comment on the petty increase on why, or ask for justification. Fact is, everything in this economy is going up except for the wages and benefits. Crappy, but that's how the old ball bounces.
Funny, I remember about 12 years ago, when a customer thought something was really wrong when the software quote was under $1 Million because another competitor, who is much more prominent had a similar product that had less features but cost $700K more. Go figure that one, but happens all the time in every industry and sector.