RimX magazine 15 round capacity options?

Looking for some feedback / recommendations on the following options for 15 round capacity RimX magazine:
  • Zermatt Arms 5-round magazine extension
  • Ace of Spades (RimX 15 round magazine by Alta Arms)
We have shot probably 2k rounds through the ace of spades. It continues to impress me. The quality and reliability are top notch. Also the ease of setting up is simple, have not touched it after the initial set up.
 
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The zermatt extensions work and I have been running them. I have noticed that here recently if I only load 10 rounds it’s been a little weak and I had some misfeeds. I haven’t narrowed it down yet because it just started happening. But I haven’t narrowed liked them and have been running them a lot.

The Ace of Spades is pretty amazing. Several guys I shoot with have been running them no issues and ran them at nationals. I don’t have a ton of rounds on mine because it was just delivered but it has had a hiccup.

I haven’t had great luck dialing in my L3i. I’m sure it’s me. If I were buying mags I would run a 10 round Zermatt and if I could get an ace of spades I would prob run that as well.

On my comp belt I have 1 10 rounder and 1 15. I don’t know why. It’s just what I do. Well partly we have 1 tire stage a 10 rounder works better.
 
Sounds like the Ace of spades could be the prefered 15 found option, but seem to be none available to purchase at the moment?
They are a really small company. I think they can make only a certain amount per day. If it were me I would get on the wait list and buy a zermatt extension while you wait. You can never have too many mags