Wundering if they are reliable at all?

NO !!!

Why, WHY, purchase that crap when you can get REAL FN mags for $20.00???

for targets...

Bought 2 of those pieces of crap, bang jam bang jam bang jam.

Unloaded the rest by hand and threw them downrange.  Fun to watch the spring fly when you hit it.

This.

Where?

Currently OMB Guns is $25.00, but they periodically run them for $19.95. I grabbed a few the last time.

Another source is Stryker Enterprises

Another voice to the choir.

I got a Korean mag on a trade at a gun show, I think it came in a box marked ATI.

It has never fed right.

Never cheap out on mags.

And my .02...

I consider it a necessity to change out the Factory FN rollers in the magazine.

The are poorly made and are molded with a parting line and are not truly concentric.

Man Kave Rollers are turned from Delrin (a self lubricating plastic).

I noticed when unloading unmodified FN PS90 mags by hand that occasionally rounds would hang up in the magazine and not reach the feed lips. After changing to Man Kave rollers this issue is GONE!

Nope! I got two as freebies a while back when CDNN had the buy FN mag and get the Korean knock-off for free. Looked identical at first but once I tried to snap it in the AR57, no go.  Dremel tool came out to make it fit (free mag remember )....Of course, it didn't feed and promptly received a boot into the nearest junk pile!

My other experiences with Korean knock offs (tested one or two of each when they were flooded onto this market to see if they're even worth the cheap price):
- AK47 drum (like the Chinese) = Failed.
- AR15 (like the HK) = Close but no dice, spring is too stiff and failed to feed once in a while.  These became great gifts for other guys who didn't really care about 100% reliability
- Glock = Failed.

The only use for them - malfunction clearing drill