Considering the options for a lap timer this season, I know lots of people use the basic XT one, but curious if anyone is using a GPS timer like the XT Pro.

It seems like it would be pretty helpful to have the data on your speeds and throttle position in corners as well as sector times. Difference in price is $350 but if it is more helpful than two track days in gaining speed it paid for itself. Anyone have any feedback on how well they work and pros and cons?