I was looking for a good armband to use with my iphone for jogging.  At the same time, I don't know how long I'll have the phone (upgrade to 3g iphone) so I wanted something I could use with other devices if needed.  The price on this one was great.  I use it about 5 times a week and have had no problems so far.  It fits well on my arm and doesn't slide down.  Note, I don't have particularly large arms, so it fits nicely.  It's probably not for you if your arms are large.  I gave it a four out of five because it's just not as breathable as some other armbands.  I'm very pleased with it.