Its a good novelty item, and a nice conversation starter for when you travel to new fields.
I've used a variety of backspin systems since 1992.
Technically, you don't really get much extra range. The ball itself still slows at the same rate. THe main improvement comes from the shape of the trajectory: FLAT, instead of an ARC.
This is because the spinning ball generates enough lift to counteract gravity during most of its flight.
THe problem with this is its VERY paint critical. If you don't use the right size, it effects the spin, and creates problems. Also, as the ball looses spin, it tends to curve in random directions, making accuracy terrible at long range.
So, if it doesnt really extend range, then why bother?
Its REALLY nice for urban/indoor fields where you want to shoot through a series of bunkers/windows/holes/etc.
In this limited circumstance, you have the advantage where you can shoot someone who can not shoot back.
But beyond that, the paint issue makes it unsutable for tournament play, but the "cool factor" makes it nice for rec-ball. Plus, it scares the newbs which is always a plus.
Nick