I ran solid strut for 3ish years, 2 years on a LT and half year on a 2016 SX120 and then I switched halfway through a season. Been running the TSS now for a couple seasons.
Would I go back to Solid strut? No. Also, would I run the TSS anything under 400 PSI? No. Once it gets to soft (under 400 psi for me and I only weigh 180) I find you’re giving up climbing, overall snow performance as the kit loses the proper attack angle. But with it stiff enough, it only flexes for a quick second, just enough to take the hit out of stuff. Which seems to make a big difference on a lot of things. Especially any sort of jump/drop where the TSS helps with somewhat of a preload effect, and seems easier to keep the bike at the angle you want for landing. Where the solid sometimes seems to send you nose first. Also on the time where you have to spend on a trail somewhere, the TSS seems to help take whoops real easily.
Setup is key for the 3rd shock but I personally feel it was a game changer once dialed in. My back certainly thinks so if I happen to be sitting down and riding in flat light.