I'm not so sure about statements that say the 500 or BAT in general is dark sounding, or has less than an abundant sound Stage. it's surely not my experience. I know it responds very well to pc upgrades. Adding solely a good pair of pcs changed the whole shooting match... more everything!
I've a mid sized room with speaker on the short wall of a 14 x 21 room and the SS extends past the side walls and out into the yard at times, given the track info being played. Imaging is good to very good all the time. Realism has gone up exponentially with the acquisition of the TA 1000 MK II, and so has the bass performance.
Double checking what's what I put my OEM cords back onto the 500 and using just a UPC 200 and Elrod Sig 3 pc... well I could live with that for a good while. In fact i have only a Taipan helix A supplying the UPC200 now. the EPS Sig 3 is on the Thor preamp... and even that combo is just stellar.
In comparison directly to price, in the 2500 - 3000 range, the vk500 is formidable competition. it's surely not the end all be all in resolution perhaps but I've not found it lacking there either. it does do justice to the musical info being supplied.
many if not all the amps listed right here can and do give good accoutings of themselves. their just a bit different here and there in this way or that. I'm just quite satisfied that it does what it does in such a way I want to continue to listen to the music, not it.
I think the best statement we make as audio nuts about a component is waht it takes for us to let it go. I've only heard a couple amps that flat out surpass the vk500, and not across the board in every respect, but for my money they do get by it. there easily well over twice it's retail price in one case, and half again in the other. ONe amp is tubed, the other SS. But that's just my take.
As for appearances, I don't put a lot of stock into appearances as some do. But the 500 has a bit of charm in it's chunky little rectangular body and doesn't draw much attention to itself with but two little offset blue 'eyes' peering into the room... maybe they could be made to wink now and then.