I recently purchased three SuperStruts; two for P226/P229 and one.for P220 (I only own DA/SA in the classics).
I haven't done any measurements of trigger pull in an attempt to collect "scientific" data.
So far, I've only installed one in a P229 that is one of my
three favorite shooters. They all have the current short seat and factory strut. I had installed a 19 pound mainspring and smoothed the edges of the factory strut that contact the mainspring. The factory strut in this particular P229 was already nice and smooth where it engages the hammer. But I wanted to try these magical SuperStruts, so I installed it in the P229. I also installed it with the same 19 pound mainspring that I already had in it. I didn't want to increase the weight with the 20 pound spring that came with the SuperStrut.
This is purely subjective because, as I said, I made no attempts at taking measurements. I'm less interested in how many fractions of an ounce that I may have shaved off the trigger pull as I am in how smooth it feels and whether I feel like I'm getting better trigger control. But, I could tell no difference between the SuperStrut and the factory strut that I had smoothed the edges on a little. I could not
feel any difference.
The installation on the Grayguns trigger and Grayguns SRT kits in those three SIGs made a very noticeable improvement in the smoothness of the action in those three guns (and others). It is also my opinion that the Armory Craft DA/SA reduced mass hammers further improved the action. I also believe that my smoothing of the edges of the factory strut and trigger bar contributed.
I believe the SuperStrut is definitely needed in SAO SIGs. All mine are DA/SA (except for my 1911s and my one P320 AXG).
Or if you have some really rough hammer struts, particularly one that might be rough where it engages the hammer, like one that Willard photographed in another thread, a SuperStrut would help. But then so would a better made factory one, in that case.
I am still thinking about whether I will go forward with installing the other two SuperStruts in my modified MK25 and modified P220. But I may just remove the one I installed in the P229 and sell all three of the SuperStruts. Because in
my one installation, I haven't felt an improvement from it.