I am happy with the one I just purchased. With Federal XM855 I was reasonably accurate (offhand shooting) shooting at about an 8x8 or 9x9 target at around 100yd. I have the Aurora sights on mine which apparently more closely simulate the original Sig SG550 sights in both height and operation.
Overall, I really dig the rifle, it cleans easily and comes apart easily, the guts are very simple, and the trigger is weird but the video made it out to be more horrible than it is. It actually isn't bad, there is quite a bit of takeup with a crisp break, and that can be changed with a sear/spring kit I have seen floating around on the interwebs somewhere.
Buy one, OP. They are slowly creeping up in price, in a weird way they are kind of an oddity and somewhat collectible.
I plan on getting a 556 lower from somewhere so I can use AR mags with mine, just for compatibility's sake.