I got this tool about 3 months ago. I have used it numerous times. It is sharp! I have only been cutting jeans and shirts, but it is like butter. The strap cutter works amazing. The oxygen tank slot works good but is a little tight. I have yet to use the ring cutter or the window punch but I am confident they will perform when needed. The only problems I see are two.
1: The holster is adjustable and nice, however the screw that keeps it from rotating comes loose at times and needs to be tightened.
2: These shears will not fit in tool slots on EMS pants like traditional shears.
Otherwise everything is awesome.