One of my favorites
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The Defender is one of my favorite CCW guns, among 2 others, that I use with confidence.
It had some teathing problems in the first 500 rounds, but since, has been 100%. IMHO, they have to be clean, mainly from powder residue, both on the feed ramp and within the upper interior parts of the magazines to stay 100%. That would include making sure the rails and guides are good and wet with oil, as timing is everything with the 3" models, what I deem, flowing freely with enough juice..
As far as being lighter, using an aluminum frame, there are benefits and downfalls. Benefits are lightweight CCW, easy, balanced, point to aim, and the downfall IMHO is one must stay within the manufacture guidelines, of what ammo one can use, and what one cannot use. And from my own experience there was no difference in recoil compared to a heavier, 4" Commander, in truth, just the opposite from what I felt, and shot, the Defender had less, for me, and was more accurate, including follow-up shots.
Personally, with any of my guns, I just use standard pressure ammo and go with the closest weight of FMJ range ammo and stay within 20gr weight for my HD/SD JHP ammo. That way the gun acts, and feels, the same, along with, not putting a lot of stress on the gun, slide, and the aluminum frame, and I expect no problems far up the road with her.
The only thing I can think of, sights wise, is maybe on a resale issue, the 2-dot bar sights that come with the Defender can be changed to whatever the shooter may like as opposed to the trench-sight of the New Agent, is all it can ever have.
Other than that, she shoots 230gr FMJ range ammo like a tack driver IMO at, or below, 62ft, and using 185gr JHP's hit home as well. And has delivered good COM hits when I have shot her one handed, without any jams.
Keep em clean, well lubed, wet, and proper ammo, and you should have no problems and a long life together IMO.
Ls