For over 2 years I ran an AC lift with SLR steering. The SLR steering held up fine, but it used up idler arm bushings rapidly. The bearings held up well.

IMO, the Calmini kit is a lot more bang for the buck on steering. It wasn't out at the time I'd purchased the SLR kit. You can use your steering stabilizer with the SLR kit, as the stock centerlink location is retained.

I also ran the diff drop kit - it was the only way I could clear an R200 diff and the 4 banger oil pan on my Frontier. That causes no interference with anything and it reduces slightly the halfshaft angles - that's a good thing with a lifted Nissan. The kit is a pain in the ass to install tho.