I've got a buddy doing OGA stuff, he has been using one since they came out without any problem.
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When I set up my 6920 I put an ARMS rear sight on it and have not had any issues with it at all. Nice quality.
I picked up a used one of TOS and it had some play. I contacted them looking to see if I could get some sort of kit to rebuild it. They said to send it in so they could look at it. I am not too far from them so I brought it by and they just gave me a brand new one with no drama.
The funny thing is the tech was kind of puzzled that it did not have the patent info on it like it was supposed to. Part of me wonders if I ended up with a Chinese airsoft knock off. Either way they gave me a brand new one.
I've been through a few ARMS products from way back and they were solid heavy units. I still have a swan sleeve 40L rear that is a chunk but has never been a problem. I too remember issues with tolerance wear on the rear sight over time and some spring issues, but never witnessed it myself.
Here's my ARMs on my mk18 mod1
http://i6.photobucket.com/albums/y218/gw4k/03387982.jpg
Just going off the looks of that sight, it looks like just as good a sight as say a Troy Battle sight, and looks much better, and more reliable than an MBUS.
That looks like a nice setup, I take it there's been no problems, maybe ARMS will make a come back some day. I have to say I like the looks and idea of there products. Price could be a little better, but that's the case with all the big name BUIS makers in my opinion!
Has anyone ever used the A.R.M.S.® #41™-B-L Silhouette™
Folding Front Sight with integral gas block?
http://www.armsmounts.com/default.asp?mode=products&sub=sights&id=[hsh]41-B
Not a lot of love here for A.R.M.S but the federal agency I used to work for had several hundred of their foldable back up rear sights in service and they had a good reputation for durability.
I was impressed enough that I purchased one for my personal AR but this was a while ago, not too many other options back then but I still like mine okay.