Amazon has several versions listed for about $600. The reviews indicate that you need very good programing debugging skills and many people are having to spend a lot of time tightening and adjusting parts to get them to work right. A few people reported having to spend a lot of money on after market parts to get the precision they were looking for. Sounds like RC tanking to me. jot
I will add that these units are less then a third the price of the Micro Mark and a number of people were quite happy with the units after they got everything sorted out.