No but I went from an 06 I-5 adventure stepped into an 08 Alpha Lux Offroad and drove it home, cranked up the torsions to 23 1/2, stuck on the winch and brush guard, went to Superlift Offroad Park that day and led a Hummer Happening for the local dealer. The front did not drop as much as the 06 when I added the winch and brushguard and I did not have to crank up the torsions more after doing so like I did on the 06. It supports the added weight better. It was my understanding the original purpose was to compensate for the V8 and cast iron diff.
It makes a big difference to me. The front end felt firm and did not bounce around as much. Hard knocks, it absorbed the extension and recovered quickly. The shocks were of course new as well but the difference is significant. You will feel more in control of your steering as well.
What are you waiting for?? lol