I've run the numbers recently, and XOJet looks pretty good vs the competition for the Citation X. Flight Options is less per hour w/ fractional ownership, but XO beats everyone else, fractional or card, including FLOPS' X card. They've been pushing a model where certain cities are favored, but the overall rates of their new programs are very good regardless of locale.
FWIW, I'm on here because, as a consumer of private jet travel, it's obvious that the pilots are the most important part of the system and I wanted to find out what's important to you guys. Over the last few months, I've crunched a lot of numbers and it's not obvious where the best deal is. It looks like a pretty efficient market, where any big advantage in one area is set off by a deficit in another. That's probably par for the course for a competitive business in a downturn economy.
Cheers