Well, while I kept a couple of Wilson magazines for range-only usage, I personally don't prefer them for defensive-carry use anymore. I've found I'm not alone in this when discussing it with other folks, too.
I prefer Metalform/Wolff ... flat, dimpled follower & 11 lb Wolff spring.
I've been trying some Tripp Cobramags, and so far they appear to function decently with a variety of ammunition in a Colt XSE and an older steel Commander. I've heard that Tripp is going to be using another vendor to supply the mag bodies in the near future, so I'll wait and try some of those, as well.
I'm reserving my opinion on the ACT mags until I've had more time to test fire them in a couple of different pistols.
I've used more 1911-type magazines than I can remember over the years, always searching for the 'best one' to use in my various .45's. I actually had the best luck for a while with Vega mags, and that was while using the JHP's of the 70's in my Commander (including the 200gr Speer standard pressure load).
I dislike the folded-leaf followers as they appeared in the Shooting Star, Ruger & Colt magazines, just to name some of them. I noticed that while the current Ruger & Colt 8-rd magazines use the same follower, they each use a different spring, both in number of coils and minor variations in design of the springs. Ruger adopted a machined dimple in each magazine lip in order to help prevent displacement of the top round during recoil, and I was told that this was the result of more folks wanting to use the heavier recoiling +P ammunition.
While the technology and production methods seem to have been catching up to the improvements and bullet design changes in ammunition, it still seems that we keep seeing a well produced 7-rd magazine, with a properly designed follower and heavy duty spring, are still often offered as the best magazines to help insure reliable functioning with a wide variety of ammunition, in a wide variety of shooter's hands ... Surprise ...
HSMITH The Wilson mag is a great mag too, AFTER you put a quality spring in it. The only thing different I'd offer is that they're an 'okay' magazine afterward, in 7-rd capacity (Govt/Comm length), with a heavier spring which is suitable for their follower (top coil shape) ... but the follower designs don't always seem to help prevent the last round from being displaced forward by recoil, especially if +P ammunition is used.
We may find out we're all attempting to "rediscover the wheel" as time passes ... to some extent, at least ...