I have some and so far have not had to test how good it is.
I do like that it's fairly narrow and easy to fit in my pockets. It's even easier to slip my hand into said pocket and hold it.
It only holds two shots which is fine by me.
Yeah, it's a little expensive, but that's not a real problem either as it's one purchase for three + years (depending on expiration date).
There are several videos on YouTube demonstrating it. I'd recommend taking a look.
I'll continue to carry mine till it expires and I'll probably get another if something better doesn't come along.