I was lucky enough that our local pram centre stocks these (The trio 4 me autofix) so I had a try of it. Loved it so much in the shop, nearly bought it there, then went home and found a nicer colour on kiddicare for £299, was well chuffed!
Obviously haven't used it properly yet, as LO isn't here, but I've set it up, and tried out all the various bits, and am so happy with how easy it is to use. It's very light too, and the carry-handle on the carseat is fabby. It has a cross-bar so you don't have to carry it in an awkward "backhanded" position, which is fab for me as I have dicky shoulders! The handle can be converted from a single bar (which my DH likes) to two handles (which I like!), with an easy insert. It's dead easy to fold, and put back up.
In terms of trying it out, are there any independent places that you could go to? You might have more luck finding a stockist there than anywhere else. Good luck!