A very pleasing feature is that the 'push fit' loco to tender coupling delivers correct spacing. Now that's an alternative that could be made standard by manufacturers offering steam models, if they don't care for the Bachmann customer adjustable screw locked slide approach, which is a whole lot less trouble than making a new drawbar - Hornby are you listening? (I mentioned this to their Rep when I encountered him in a shop two years ago. Positively I hope, they look and work beautifully, but here's a small thing that would ice the cake.)
On the SECR liveried D type from Rails there is a height mismatch between loco and tender, but one keen type has already shown that to be fully and simply fixable, the loco tender body just needs thin spacers interposed at the attachment points between tender body and underframe, and all is aligned. (In other words, parts probably accurately tooled in terms of external appearance, but something 'got lost' in the design or tooling of the contacting surfaces for assembly alignment. This afflicts several models I have purchased made by other than Dapol, to the extent that I am beginning to think that one possibility is that this is systematic, relating to a 'feature' in CAD/CAM. The upside is that in every case so far, very simple and invisible modification at the contacting surfaces produces a perfect fit.)