The BW works well, but is prone to chain stretch and the VC locking up. I had chain stretch on my 300TDi RRC, and didn't bother with a new BW, just fitted an LT230. I noticed the road manners changed quite a bit, especially in the snow, but you get used to it. I think an LT230 with ATB would be the best of both worlds, but the Classic isn't driving at the moment, so no use spending money on that and finding out.
Other than the output being on the other side and the high/low mechanism being operated by an electric motor, the P38 BW is identical to the RRC one.
Not sure how much longer mine will last in the P38, but definitely researching options to adapt an LT230 (I think it's possible to turn it around and drive it through the PTO hole).