We've been using it for years now. It works flawlessly for us. The only support we need after these past years is having new transponders to sell to new people who show up to race with us and they want their own personal transponders to own instead of using our house ones.
iLapRC 's website is:
http://www.rclapcounter.com
The other track around here that uses it is:
Outback RC, Marengo IL
http://www.outbackrc.com