Having bought the Osborns limited edition Iron Duke (oh boy, even I can barely see those damn gold arrows!) I have to agree with the general sentiment on the loco.
It looks great, above the running plate... Finishing is lovely, paint is good, lining is neat and crisp etc etc.
It performs fantastically. I only had 10 coaches to hand at the time, 5 old Farish mainline Coaches, 4 Dapol Collets and 1 Autocoach, and it handled them with ease. I never run trains longer than 5 coaches anyway (small layout sadly) so that's no issue. Slow running is good, so shunting manoeuvres and the like are possible.
However, for over £110 the fact that the wheels look unfinished, and that the motion is a huge let down. The majority of their previous locos have managed fine, so i'd love to find out what changed with the production of this Loco... Sadly Dapol have gone rather quiet on the matter, which i'm hoping means they're rather embarrassed about it and are working to solve it for the next batch.
All in all though, it's the best representation of a Britannia we've ever had in N gauge, and with a little it of work, it's a bloody good loco.