We used an earlier version of there data logger and had problems with it, then did not get very good customer service. That said I have no experience with them lately. Have heard customer service complaints on other boards. I wish I had better answers for you but I would not buy one, my 2 cents. Here is one that I would recommend, not what you were asking I know but I'll throw it out anyway. Reasonably priced and easy user interface.
http://www.rpmperf.com/
Curtis