Well...it probably wouldn't be much powerwise. You would probably see a small increase in gas milage and a smoother idle. Some have built in rev-limiters, which is always a plus. If you opt for a digital there's a whole lot you can do.
If it's worth the cost is based a lot upon how much money you have to spare I guess. I think I spent like 200 for my 6AL, but the problem is I can't tell you an individual difference with just that component because I swapped in a cam, intake, coil and headers along with it =\