<Disclaimer - I was a fit donkey for the first set, so am biased toward this product, and MT4x4 in general. Having spent a couple full days at the shop, I know they're a solid group of guys.>
Good call on the installation being involved - I guess that isn't immediately obvious.
The reason for those who are comparing vs other LX options, is that the frame plate is an L shape that fits beside and below the frame rail, and needs to go behind the AHC hardware that is on the outside of the frame. In other words, instead of a couple support feet, the main support is lengthwise along the frame rail for quite a distance. It is burly! There are holes in the side of the plate to reattach the AHC bits back on top after the plate is in place. The closest analog in TLC land is the frame plate on the BB sliders, but that is a flat plate vs an L shape, so the MT solution is a unique and incredibly solid foundation for the slider. Additionally, it allows the fronty front and backy back of the slider to have a support foot (the back is tied into the RLCA mount as well), so there isn't any deflection opportunity front to back on the slider.
Thus the install is (very general):
Remove the AHC HW bolts on a side.
Fit the frame plate. Mark the under frame for drilling for rivnuts (on the underside of the frame rail)
Remove the frame plate.
Drill and place the rivnuts
Reinsert the frame plate, secure with all bolts
Reattach the AHC items
Then in some order
Attach the slider body
Attach the AHC skid
I was install #1, and it took about 6 hours for both sides, on a lift (though I don't think the lift was too critical). Of course the install was by the designer, so that was a plus, but it was also the first one, so that was a minus (as far as speed). So 6 hours is probably best case-ish.
I've had these on for about two years now, and based on my direct experience, they are the business.
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