Functions properly.
Places the tank in a comfortable position.
Weaknesses:
Doesn't come with screws.
The On/Off can become very difficult to unscrew.
Review:
It has functioned properly and has not shredded an o-ring on me as of now. However, the On/Off has became extremely difficult to unscrew.
My suggestion is to not overly screw the On/Off nob in or else it may be too hard to unscrew. A very little bit of lube on the outer oring can always help too.
Conclusion:
A functionable ASA, works nearly flawlessly, has a rail. Not too bad of a buy for the money.