I’ve been a long time believer of Simpson. I did leave for awhile when Bill left to start Impact. We were the first off road racers to use Impact belts.
But I have since gone back to Simpson. I really like the FX latch system. The belt adjuster is intergraded into the latch & link hardware. So as some have said pull downs are hard to do through the seat, but with the FX you are pulling at your gut. Some don’t like them as the buckle is bulkier. I also only run 3 inch belts and use the cam shoulder belt release adjusters. As a personal preference I also do clip ins, so it’s easier to pull the belts when washing the car or cleaning the belts.
Another custom touch I do, is I added a stitched loop piece of nylon material on the left shoulder belt to slip the intercom plug through. This way I’m not chasing the cable when belting in as it’s right on the top of the shoulder belt. When racing it was zip tied to the pumper hose making it easy.
Im contemplating trying a new rotary Cam Lock they have. It’s suppose to be more dirt resistant & water resistant. Score has allowed rotary cam locks in the last year or so, but I don’t know anyone using them yet. The new Speed UTV is coming standard with Cam Lock 5 point harness, but they are 2 inch.
One more thing, I suggest you only buy SFI certified belts. The reason is SFI means they have to follow a standard. Hardware has to be forged, with a breaking point min. The belt webbing has to meet stretch and tensile strength and be flame retardant. Each lot code of material has to have a test and be recorded. Belts that are not SFI could use cast hardware & latches. The belt webbing could be made from tie down strap material in China and sewn with standard thread by a 9 year old.