I've just ordered two, as delivered green and GSYP non weathered. In fairness to the price its a model with fairly limited appeal, small runs (compared to Hornby etc) and extra expense in tooling up two completely different bogie sideframes etc. Its not that much more than their class 14 which has been done in similar circumstances.
Would be happy if a couple of quid from each sale was going towards the restoration of D5705 though (as Heljan have done with one of their Class 15's), it may get the old girl up and running long enough to get the makings of a good sound chip!
I take it there is no estimated release date as of yet?