What did you think of the Clayton, if you bought one.....???? I gave up with the fitted motor, after being sent a replacement to fit by Howes and that failing too, I bought a Mashima motor, fitted it myself, and continues to run perfectly.
Otherwise my Heljan locos too, are also pretty good runners....the lights are not reliable on occasions.
But then again............diesels seem to be more reliable generally, than steam locos, so I think that is fair to say that Heljan had less to go wrong perhaps....but of course Heljan have yet to prove themselves in the UK steam area.....however thats all about to change with the Beyer Garrett of course....lets watch this space.