Picked up a set to work on dry-fire with my Sig Sauer XFive. Great investment, has definitely improved the consistency of my drills and I don't worry about making mistakes and damaging my actual mags.

Great. I like these a lot so far. Initial impressions are very good. I have the Glock version. They fit, lock into place, and release just like a real magazine. The spring pretty closely imitates the feedback of inserting a loaded mag when the slide is closed. The material is a very thick plastic, they don't feel cheap at all. I didn't find the country of manufacture anywhere on the packaging.

They weight is pretty close to the real thing:

The training mags weigh 9.0 oz

17 round Glock mag with 115 grain weighs 9.8 oz

17 round Glock mag with 147 grain weighs 11.0 oz

I don't foresee having any problems with these. Time will tell...

Worked very well initially, then they both started not ejecting or ejecting poorly. I noticed a slight burr on the plastic tab, that was causing them not to work properly. I used a fine small file to smooth out the burr, and they have worked flawlessly since. They definitely feel like a loaded mag and would have given them a five star if it was not for the little hiccup I had with them. It took all of two minutes to fix both of them.

They work great, only con was the first time I did a reload one of the mags partially broke internally so it doesn’t always allow me to rack the slide.

Great product! So much better than dry fire with snap caps.

Just received my package after being on backorder...

This things are great - my normal magazines would take abuse by either falling on the ground or having their feed lips contacting the magwell, causing all the dents in the bottom of it. I would have a single dedicated magazine for insertion on reloads that would double as a Barnie in matches, it would have two dummy rounds on top and I wouldn't care too much about feed lips, but the rest of the magazines would be the ones dropping on the floor. Sure carpet helps, but I would still see the retaining pins on basepads move over time. And, the weight wasn't right. I'm not a big fan of playing with primer-less rounds loaded with my usual bullets. Too much room for error.

These are not metal and feel much gentler on the magwell (when I miss the reload; in reality, I don't care about the magwell, I care about the real magazines). They are also the correct weight (not sure whether it's equivalent of 20 rounds of 180's, but it definitely feels like a loaded magazine). Then, they have what looks like a follower on top and was a bit confusing initially, but then I realized that it's supposed to simulate the top round, with slight springiness to it, to emulate the correct pressure during insert. Makes it quite realistic, similar to what I was doing with dummy rounds.

What's not to like? Solves all the problems.

Disclosure: I have literally just opened the package and tried it out for a while. Unless these magazines fall apart (I train every day) they are worth every penny. Even if they deteriorate after a few months, it would be money well spent.