I've got the S&A on two Colt frames. Recommended, with only one small reservation- depending on hole location in and length of the frame, which seems to have varied at Colt, they can require a bit of filework to fit properly. Nothing retarded, but my Series 70 frame wouldn't let it drop in until I used a hammer on the crosspin. Tried the same funnel on two 1950s Colts I had at the time- no problem.
I doubt there'd be any such fit problem on modern Colts or clones made on modern tooling.
Perfomance-wise, I'm very happy with how it slickens my reloads. It's a great big funnel. Looks- and design-wise, I wouldn't use anything else. I think the Wilson mag well looks like bolt-on performance parts from Canadian Tire. (The guy had a mullet, f8cksakes.) I love Ed Brown's quality and use several of his parts, but have stayed away from the Maxi-Well because of the awkward overhang, and the two-piece design. I'm the guy that parts falling off happens to.
SVI have one, but it's expensive, and to my eye, deeply ugly.