Just curious have you tried surface type cover 2? You did mention you own a Surface Pro and not a Surface 2 Pro, so perhaps you are using the first gen type keyboard? Also please take note sracer said "best keyboard on a cover that I've used". So perhaps he is referring to a keyboard used as a cover.
I bought and returned one after hearing how much it had improved. I found it effectively the same.
As said above, it's "the best keyboard on a cover I've used." That pretty much says it all. It's pretty good as a keyboard accessory for a tablet. It's terrible as a keyboard replacement for a laptop. And the problem is that the Surface Pro makes for a pretty lousy tablet. So what's the point? Make a GREAT keyboard accessory and this product might have a future as something other than a niche.