1 - Its great for the surveying function alone - seems like every year the ice moves a couple bouys and this is much easier then the total station.2 - For an experienced driver it helped in the beginning, you could get actual data on boat path - straight, in relation to picking up the skier / giving the skier a good pull. doesn't get used as much now..3 - For a not as experienced driver - its great to tell your spouse how they are driving without actually telling them how they are driving.4 - Reliability is so-so, most days it works great, but seems like it always needs: restarting, looses lock, or is just off (CL is off 5' on the box vs actual boat b/w the guides)5 - It can be a distraction sometimes drivers trying to get those 0's!