BTC-TC's UX is generally pretty rockin compared to everything else I've seen. That said, the general design aesthetic doesn't look super good or professional (sorry, Burn!)... sort of like Reddit. Hurts the eyes, but it's nicely functional, and that's really what matters at the end of the day. It's what keeps people coming back. Burn being an active, fairly transparent, and generally responsive participant also does wonders and helps maintain confidence in the service.