Best connector I’ve ever tried (Gen3) were the Zev v2s. Now with the gen 4/5s out there it’s a crapshoot. Grab a JG or a Vogel, or a Zev ultimate kit and don’t shoot anyone else’s Glocks cuz it’s always greener on the other side of the fence…
For me it’s the finger grooves. I’ve had a hand injury that resulted in my right middle finger being about 1.5x its normal size and the finger grooves just makes it awkward. When the Gen 5s came out, I started buying Glocks again. Way cheaper to mess around with than my HKs…
Got my G45.5 just to try the GPT, it’s meh… slapped on a JG Vex shoe, it’s better, less meh… $1200 into a gun just for fun.. dunno what another $200 worth of JG stuff would do…