That's a cool feature indeed. I wonder if it gives the actual angle itself along with the horizontal distance. I also wonder if it will give the straight line distance or the horizontal by selecting which you want before the reading is taken, or even afterward.
For me though, I'd like to get used to using the method Sierra advocates with the LOS distance rather than horizontal like the military teaches. It's a more accurate method when it's needed, but 80% of LR shots would still be at rather gradual incline/decline angles and shorter ranges I'd think, so either method is probably accurate enough most of the time.
Len's unit and the Riegl
unit are the best out there I believe, both about $6500 though.
This is Riegl's LR model here
FG21 - LR