I've just completed a SFO-HKG trip with tickets from them. Their fares seem very competitive although it is difficult to get the exact times you want. I got a 1st Class ticket for $3200 but had to fly Korean thru Seoul. I did get Delta points and - to preempt any comments - the service was superb. 777 SFO - SEL and 747 SEL-HKG - none of the pilots bounced the plane on landing!

I've tried to book some European trips but they don't seem to have any deals to London HOWEVER, they have great 1st Class fares to MAnchester so if your schedule is a little flexible you could use them to MAN then jusst buy a MAN-LHR ticket and you'd come out way ahead.