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I use Deco Planner and DPlan - a Palm based version of Deco Planner and consequently tend to prefer computers with adjustable GFs.
The thing is you can't just pick one set of GF's for every possible dives. To keep it really simple, you can modify the GFs to modify the first stop depth and the time spent at the sallower stops to modify the curve. But what you'd want to use on a deep trimix dive with a fairly short bottom time is different than what you'd want to use on a longer, shallower nitrox dive, so there is no magic set of GFs.
But...once you understand how it works, it is a great way to adjust the conservatism of your dive profile.
Off topic a bit. Does anyone know what type my Mares 2 is? Bulhman EE washout, Spencer limits, etc. as per the 3 types listed in the PADI DM manual. I've searched the computer manual and come up empty. Also, how would you know which of the 3 types other divers have?