Here's my experiences with CT grips on my j-frames.
1. Overall, I am extremely satisfied. The bottom line is, at 60+ years of age, my eyes no longer work they way they once did--and, coming from a marksmanship background, it's real easy to fall into long-ingrained sighting habits in a shooting scenario. (Believe me, Phil DeGraves, I know how to use sights--but overcoming the marksmanship techniques I traditionally have used is important, IMO, for carry / PD shooting.)
2. The LG305 grip I have on my 640 has been problem-free from the git-go. It is visible in bright day shade out to at least 50 feet. Once I figured out how to do point shooting with them (and once I had acclimated to DAO), I've shot heads-up benchrest goups of 3/8"h x 1&1/4"w at 15 yards.
3. The LG405 grip on my M&P 340 has been problematic, but it is most likely a peculiarity of my hand muscle structure and use. I've torn out the left side of the recoil pocket on three of them--the first, after about 75 rounds; the second, after 5-10 rounds, and the latest / third, after about 600 rounds. Since no one else has complained of this happening, I have to assume it's "my quirk"--and CT has sent me new ones / exchange promptly, per the warranty.
4. As illustrated in this thread, the benefit for all shooters comes in dry-fire practice at home--print out one of those diagnosis targets and work on your trigger stroke / gripping.
Highly, highly recommended--other shooters here have offered up the benefits, so I won't be repetitive.
Jim H.
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