Google is your friend. Look at reviews and videos of real people that have bought them. Not the promos from the manufacturer themselves.
I am pretty sure that you'll get an unbiased opinion of how good of a holster they really are. I will say this. I bought one of the iwb holsters.
Sold it to a friend for half of what I paid for it. It now sits in a drawer with his other unused holsters. Then I bought a real holster from Milt Sparks.