If you have big beefy arms, and you're going to work out, this will do a job for you. But if you have small arms, you'll find that there's too much material in the strap, and you won't be able to get a snug fit.
The armband is also large in comparison to the player. The opportunity was there to make something smaller, more in proportion to the player, but you end up with a great big carbuncle on your arm. The amount of material in the strap, and the nature of the velcro fastening also mean that it's very awkward to try to get a good fit with your spare hand.
The pouch into which you put the player is also open ended, and whilst maybe in practice it could be safe, I was worried that the player would fall out. It would be simple to add a retaining strap.
I wanted something that I could use when out and about, that isn't too big and obvious, and is easy to do up and adjust. This isn't it.