CycleX tubes (for 550) look great. I managed to get a set back in April '13. Emailed them sometime in March, asked for an estimate on when they'd be back in stock. Gave them my phone number, and got a call when they were in stock, and snatched em up. I think they ran out in just a couple weeks.
I haven't run them out on the road, but on the bench they look fantastic. If you don't like CycleX or would prefer to support a long-time, quality, family-run business, then don't hesitate to go with Frank.