Yeah i think the only advantage of smoothing groups over edge control is face selection. Setting smoothing groups to get only 1 hard edge in the middle of a sphere is a bit of mind gymnastic but doable. Pjanssen's script does the gym for you :)
I bounce between Maya and Max quite a bit......definitely not a fan of controlling edges with smoothing groups....I prefer the way maya does it. @kurt_hectic: I've never seen that script before. You just made my day.
Two points: 1) Often my models have normal maps and the smoothing is all in the same group, sometimes one group per separate object if there are multiple objects/elements. That doesn't mean I don't use smoothing groups, I do. I just don't use them for smoothing, heh. A hard edge on a high poly is often too hard and I would…