These kits are all available in the UK now. Many high street stores have them in stock, not just model shops, I think Woolworths have quite a few on sale now.
I've bought the Jedi Starfighter and have to say that it's light years ahead of the old AMT/ERTL Star Wars kits. Certainly not up to the standard of the latest Hasegawa/Trumpeter/Tamiya etc. aircraft kits, but then again they are mass-market, low-price kits and aren't aimed at expert modellers.
The level of detail, inside and out, is very good, and the scale of the kit (about 1/27) isn't far off that of the Hasbro toy spaceships.
They are all pre-coloured (apart from the Star Destroyer) but there's nothing to stop you from repainting them (I certainly intend to!)
Can't comment on the others, not having bought them, but I may also pick up the tri-fighter and the AT-RT some time in the future.