Well, the onboard product will probably be fairly painful, you won’t pay much for the ticket, and you will be nickled and dimed as Skybus tries to generate high levels of ancillary revenue.
I put my parents on a RyanAir flight out of Ciampino to Stansted a few years ago. The ticket price was reasonable but they got absolutely reamed by the excess luggage charge. Ryanair's baggage allowance is only 15 Kgs. For international travel that is absurdly low. There is no way that kind of excess charge will be tolerated in the States.
I far far prefer the likes of Eos and Maxjet to this kind of crap. While Eos and Maxjet may not be successful over the longhaul at least they offer a quality product.
TP