I used Contender Pachy's from pretty close to when they first became available. Didn't care for the Presentation design, but the Gripper's were top drawer for hunting. Even when I still had my last 20 EO frames, besides all the custom and factory furniture for them I also had Pachy Gripper sets for all of them. So similar to Walt I had used them forever and preferred them for most of my handgun hunting and for shooting IHMSA. However, I also had to modify many of them, some grips and the forends, and I always used custom hanger bars instead of those that came with them once I had a source for them in quantity. With some grips "slag" conflicts with mounting without bind; and with the forends to be truly "floated" they have to be relieved or shimmed to not ride on the barrel at all. Became a first thing with every new set of Pachy's I bought to remove slag. Just manufacturing tolerances and design, not that hard to fix. But also maybe not always necessary with forends except on Contenders being used for long to extreme ranges. How much a Pachy forend effects barrel harmionics if at all is speculative and probably specific to the handgun/cartridge. Easy solution for me to not worry about it at all was to use the custom hanger bars on every barrel I owned for factory, custom or Pachy furniture, and if needed with an added shim to always have them off the barrel completely whether handgun or carbine.
Contenders have always been about some tinkering, and the tricks to make them the best possible are well known. Few took it as far as I did maybe, but also few probably used them as much at long ranges as I did, especially for very small varmints and for predators. Smooth as glass trigger and action, faster lock time and the best glass I could afford and knowing the exact ballistics made a lot of difference on precision shooting at longer ranges.
To each his own, just my opions, but the abilities that can be acquired with them is in part why the Contenders played such a large roll in my shooting and hunting since the first in '68 until the health failed.