Nope. The GP100 grips may not be pretty, but they're great grips. Very comfortable.
You do need to lose those checkered black cheesegrater grips on that Blackhawk.
After 50 rounds of PMC 180 gr HPs my hands felt like they'd been assaulted by a wood rasp. (New Model Blackhawk Flattop .44 Special)
A pair of grips from CLC Custom Grips or Private's Custom grips are much better. They're thicker, where they need to be thicker, and smooth.