Have over 20 Kadet 2 Mags for four different 75 Kadet 2 conversions and one for a Shadow 2. The one thing that I will say about the Kadet 2 mags is that they are much tougher than the average 22 mag and they last longer. Have only had one go bad in half a decade of using them in routine action competition. Most of the people I compete with use Ruger, Browning, or 1911 conversions. They replace their mags every year or so.
The only thing I have to do is clean them after each match.
Hope this helps.
JW