I like this buoy for its simplicity, and its ease of use: just inflate with you spare second stage. No valve, no oral inflation tube, just a simple open bottom. It is well made, sturdy and I like the velcro closure on the storage flap.
But, two things need improvement: One: the plastic retaining clip is USELESS and therefore dangerous underwater, as it is too tight and too small: you would not be able to easily UNclip this from a D-ring! This would render the buoy useless under water, not a great idea. Solution: I cut this plastic clip off and replaced it with a proper stainless steel clip that will work reliably under water. TWO: that plastic 'spool' thingy is cute, but it seems like a great way to tangle your line under water, so I replaced that with a small stainless finger spool with 15m of line and a dual ended snap hook. Now I have a great SMB, easy and reliable to use.
Does just what it should, can't see why anyone would want to pay more!