Had the mount for the iPod Touch, so am upgrading. iPhone has built in image stabilisation, so this is an incremental improvement cf having the 'wow' factor, but nevertheless does give a smooth and crisp transition. Recommend for serious amateurs who want a decent pan handheld, without having to use a tripod.
if you already have the go pro mount, this is a great addition for lowlight or indoor situations. I think the iphone does a little better job with sound as well and it is the hands down choice if you want to share your content in realtime through ustream or immediately after capture with Facebook or other social networks.
This snugly fits my iPhone 4s. However, it will not accomadate a cased iPhone. I'm giving it a 5 rating because it does what's its supposed to do. However, since I keep a case on my iPhone at all times ,constantly dropping phone, I will have to get something different.