Haven’t tried those ones but if your after a bog standard STANAG metal mid cap I can definitely recommend the Classic army 130rd’ers , I’ve been using them for over 14yrs now (and quite a few are that old) and I wouldn’t use anything else . And as a bonus you can find them a fair bit cheaper than those ones ! ?
I have a few of those and you're right they rock in every weapon I bang them into, and do it with a very nice sound as well, but just wanted to try something a bit different.