I got mags on my HH, based on what I'd read here. Thing is, I had to remove material (then remove some more) until I got it to where I thought it was ok.
Fast forward to sending the HH back for a refurb and I got snakeskin. It feels VERY, VERY good to me now. The best feeling knife I have.
I have since acquired a FBM w/ mag G-10 and it felt alright, but not as good as the HH w/ SS. Then I got a FBM tan w/ G-10 blk/tan magnum scales and it felt very good. I measured the difference between the two mags and found the blk/tan to be 1/4" less than the other one.
Out came the Foredom (fancy Dremel) and I made the black G-10 to be the same as the blk/tans.
In addition, I have a FBM in black and one in muddy, both w/ SS. They both feel pretty good, but not as quite as good as the HH. If the HH is 100, the two FBM's w/ SS are 90. The recontoured black G-10 is 95 or so.
You could argue that the mags give you the extra material so you can sand it away until it feels good to you. But that can be a major pain, as well as remove any of the original texture.
As for me, as far as the Fusion handle goes, due to the variation in the magnum scales, I'll be ordering the standard scales from now on.