i've only flown silverjet, but found the services at both luton and ewr to be top notch. food was great -- way better than we've gotten used to on most domestic airlines' international or transcon service.

on board it was extremely comfortable, and felt very spacious. plus, (and i realize i sound like a huge snob saying this) you're surrounded by higher-end passengers, so you're unlikely to have any disruptions or fellow passengers who have no idea how to behave in such a situation, as i'm finding increasingly on regular carriers.