I put the handle from my Maggard MR1 on my Gillette Fat Handle Tech today. The extra heft, and even better grip, made for an even easier FH Tech shave than normal.
I also use a Gillette Tech with a custom (heavier) handle. It's a game changer compared to the ball-end handle or the handle in your second picture (first post).
I just finished my 6th shave with this handle using the same Personna Med Prep blade. All have been excellent. I really like this combination of weight, balance, and handling.