These took close to a couple of hours for me to install, though I could have done it quicker. I was pretty meticulous and also took the time to vacuum and dust the rails of my rig in the process. I mounted the bracket directly to the bottom of my seat, and then attached that to my slider rails which are mounted directly to 2 cross-rails on my aluminum extrusion rig. The sliders raised my seating position 50 mm in the back and 81mm in the front which substantially changed the geometry of rig. I wanted the front higher, but I would have preferred to keep the rear where it was originally. Ultimately I was able to order pre-cut aluminum extrusion pieces and replaced the ***** cross rails with *****, thus lowering the seat 40 mm while still keeping the added angle. This was much closer to the original height. The metal brackets are very solid and will not bend of flex under normal human powered forces. They look really nice on the rig and most wouldn't notice they are even there.
I bought these to take pressure off my back - I had been starting to experience a fair amount of back pain after spending long periods in my rig, and this did the trick.
