Unfortunately MRC decoders aren´t great, they are pretty low quality and I have read quite a few reports on various forums about their unreliability. They are very cheap that is true, but if you´re getting a sound decoder for around the 50 pound mark then you can?t really expect anything more. I would personally advise to stay away as if you are in the market for a DCC decoder then a little extra cash would be better spent on more quality products. Or at least in my case I`ll try and save up untill I can afford the sound boards that I really want!
All the best,
Gavin