The Middle Grips looked like they are too thick/raised to high for a comfortable and smooth transition. but that is just based on the pics, plus some bias on my part. I have never been a fan of those rubber wiper style grips. But then neither was Mark Hamill or Hayden Christensen
Since the grips are in the middle it's not as bad. The Electrum Wind has the same grips and is about a wide - about the same width as my US Graflex lightsabers too, but the Graflex are plastic, the grips on the Dominicide and EW are aluminum.
Note: THe grips are held in by the now normal roll or spring pins, so if you so desired, you could probably hammer them out and remove the grips. I believe the grips are there for 2 reasons: a) decoration b) to give extra support to the chamber section. The way the set screws are used to attach the center, I believe someone who's enterprising & savvy enough could make a replacement section to replace the one that exists now, with a smooth exterior. Which could be longer or shorter too.