I recently purchased a LDG AT-100 autotuner from W4RT as described on their web page: http://www.w4rt.com/LDG/AT-100AMP.htm The tuner I received was a PROll model which doesn't even have a socket for the replacement CPU to turn it into the AT-100AMP. So far, they have not responded to my e-mails and I have opened a dispute with PayPal. 73, Roger