Went back to a model shop the other day I'd not been to since I was a child and... because it also happened to be my birthday, bought a Hornby 4VEP for £125 (which seems very expensive to me...!). Anyway, it looked nice and had lights, curtains and all the other pretty bits... and also, birthday. Else I'd be on a Leading Auction Website, like Mr Sprinterguy up there, buying up stock from Best Intentions projects, or...whisper it... dead guys...
Got it home, ran it... and it derailed over pretty much every bit of slightly imperfect trackwork and most pointwork.
It's been returned.
I'm not sure who these models are aimed at but from what I can see, unless it's an exhibition layout running in a more or less straight line from end to end, you can't even use these things (from what I could see, it's mostly due to the bogie design in conjunction with the couplings not allowing enough movement between the coaches). I have the same bogie problem with a rather nice Dapol 56 (which happened to be alot cheaper, so not too fussed) and a few Bachmann Mk2s when coupled.
When I mentioned this while returning the 4VEP, chap who owned the shop agreed and said that he gets loads of returns for very similar reasons. So go figure...