The problem with the AE XPS and spectrum receiver is rather well documented. I think the post I read on it was even here at RC Tech. If I remember right the problem is a delay in a signal being sent and the unit timing out so you end up with the 2 not talking to each other.

The XPS is a decent and small ESC. And the spectrum is very popular so it would be nice if the 2 worked together flawlessly. It would also be interesting to find out why some have the 2 working with no problems while most do not. Maybe a simple setting change like disabled reverse could be the solution? But I doubt it.

I am also not sure the problem is really AE fault. Its not like the XPS is broken, it just expects a response from the receiver and doesn’t get it in time (I think). And even with the popularity of the spectrum receiver I don’t se AE releasing a spectrum compatible unit. I don’t think it is a piece of the market they are really after.