I don't know anything about this chronograph, but I bet RCBS does not make it. I am not a fan of the Competion Electronics Pro Chrono, even though I have one, but it is reliable and durable. It sounds like they are trying to make it right for you. If it gets to be too much of a hassle, look at a Pro Chrono. You can get them for around 100 dollars. Keep in mind that these type of inexpensive chronos are + or - 3% accurate. They can be used to see if you are gaining or losing but don't trust them for absolute accuracy.

I hope they get it worked out for you. Pact overnighted me a new computer for mine at their cost when I had an issue and they tested it first.