A few weeks ago I was at the range and a gentlemen had one mounted on his 308. I will admit that my first impression was that it was a total waste of money, but after looking it over, it seems pretty nice.
As far as it's usefulness for the money, that's up to the individual. It will run a little over 3000 for the system because ya need a mark 4 leupald to mate with it.
It will be calibrated for your load and tell you where your point of impact is based on where you turned your turret and the angle of the rifle. Neat stuff, but I'm not going to be saving my money for one just yet. It would definatley make it easy to quickley change your poi by making it unessesary to count clicks and do any other conversions. It doesnt do anyting for wind - which is the real challenge of a long shot.
I used to re-load but now I "hand-load".
-- Well, at least I try