Dryfire Systems

I got to use one of these at the Grand Pacific last year. It was set in a small utility trailer with only enough room for one person to use and actually 'move' between all 5 stations. It took me a minute to get used to shooting at a tiny red dot but I really liked that it gave me a printout of exactly where I was shooting in relation to the target. I want to know more about how the system accounts for gun type, choke, pattern, barrel, yardage, etc. I recall having to enter all of that information into it for the initial setup. What I find questionable is I know a few people who have these and I don't see how it has improved their shooting but I also don't know how much they actually use it. Additionally, I haven't been around very long and maybe they have improved drastically and I just wasn't there to see it. I would like one so I could keep the visualization in my head on days when no clubs are open for practice. Plus I figure if I bought the system that projects doubles and just used it for a month instead of paying for doubles practice it would be the same cost (probably cheaper when I figure in gas and the obligatory coffee donations).

--Heather