I have been running the 29SF with the standard 10 rounder, but I carry one 15 round 20 magazine with an arrendondo +5 mag extension as a backup.
I have put a couple hundred rounds each through both mags with the extensions with zero issues. I run one with the sleeve when it is my hiking/outdoors weapon, I run the other without the sleeve as my backup carry magazine. I highly recommend them.
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Here is the mag without the sleeve...
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I get the sleeve, but I have to admit, I am looking for a way to reduce the size of the heel of my carry gun. I have even considered having my Para wide-body bobbed. In fact, if I could find another for the steal I paid for the current one I would surely do it.
None-the-less, that is a sweet carry rig.
I carry AIWB with the 10 rounder a +1 and carry the sleeveless one as a backup only, but when I am out on the rhino in the desert or hiking I go open/concealed/ (no real care due to laws) hip carry with the sleeved 20 rounder +1 to give me that extra firepower.
That is one think I like about the Para. With the Triple K mags I have 17+1 on tap. I carry in a Crossbreed Supertuck IWB and it only prints under a shirt if I bend just so. I think a bob would eliminate that.
They work great in my experience. I have one for my M&P40 (holds 19) and one for my G20 (holds 20). I've put hundreds of various rounds through both with no drama. I use them for backup mags unless they're doing house duty.
(http://i113.photobucket.com/albums/n235/enidpd804/Guns/DSCN2927.jpg)