Certainly haven't! But if it suited my chosen modelling, I would have one (or more as appropriate to the area allocation) like a shot*. Seen it at a couple of shows, looks right overall, well detailed and finished, ran very sweetly. So, on the money by the standards of current RTR. Takes a 21pin decoder, I would use one of my stockpile of Bach 36-554 as it is likely that this cheap but competent decoder would be more than good enough for the intrinsically smooth running mechanism. Failing that, a Lenz silver 21pin, never found a centre motor chassis it would not drive well.
*It's the similarly styled (also of NBL origin) class 21 I am waiting on from Dapol's announcement list. Hopefully Dapol will make an equally good job of this, and my home brew class 21 (much altered Hornby class 29 body on a Bach 25 chassis) can be withdrawn. (It runs sweetly enough, the Bach chassis being a class act in this department; but the body is very much compromised in many departments, and I have improved it as far as my skill allows...)