South African M-11 mags

I have an SWD M-11. I have 4 of the Cobray zytel 30rnd mags. All the zytel mags work great....hardly ever a jam, runs great, no problems. Gun works great.

I saw some South African metal 30round mags. I was wondering if anyone has tried these...and if they are any good?

I was thinking of buying two...20ea = 40bux. I don't want to waste 40bux on garbage mags....so any input on these S. African mags would be greatly appreciated.

thanks,

D