I installed the VQ accurizing kit on my MK IV, which includes all of the same parts you mentioned. I agree that it was a tremendous upgrade, but I did end up changing the physical trigger. In my opinion, the VQ trigger is curved way too much, resulting in a very short length of pull. Larger hands probably will feel that they are reaching way far back just to touch the trigger. I feel the Tandemkross or majestic arms trigger is a better fit. Otherwise, everything about the VQ upgrade was worth it.