I agree, I use several makes and types of decoder, I have old decoders that have been out dated before I've managed to fit them, so long as they can do what I want I'll still fit them. Definitely set momentum to zero while matching otherwise you have to wait for the speed to settle, BEMF will still work the same, yes it effects sounds but not speed response.
I do mine on a rolling road, which means I can set them to set speeds and do it in a consistent way loco to loco, I haven't found a loco / decoder combination that doesn't work yet and I started this a long time ago.
Mike Ruby
