I rang Digitrains recently about upgrading decoder chips. Jeremy was very helpful with advice, and I purchased a couple of chips, which were delivered very quickly. One of them was faulty, so I phoned Jeremy, and he said they would replace it, no argy-bargy or questions. A replacement arrived 2 days after posting the defective one back. Now that is good service!
They may not be as cheap as the box-shifters, but their service and experience are worth a lot. I'll use them again.
John