Great lasersight - slight problem - Crimson Trace Laser Grips for Glock 4th Generation Pistols

I use CTC lasergrips on all my pistols, starting with my 1988 Glock 17 (Gen 1)!
I actually prefer the feel of my grip with these installed and is a great addition to my Trijicon night sights.
It also allows me to instantly co-witness with my fixed sights (to verify my alignment, etc.), I actually install these first, sight it in, then install the new fixed sights to align with it - easy peezy!
This model is an improvement over my older model (LG-617) because of the master ON/Off switch.
However it seems the rear activation button is less effective since they went to the smaller push switch.
My older model had a larger molded in button that always worked as soon as I ready the gun, this one sometimes turns off just as I am pulling the trigger because the contact area is too small.
I really hope they bring back the larger button - then I would give it 5 of 5 stars.