Yeah I use it on my S3 also. I like how it gives you I'd guess you can call it live ISO viewing, in that I change the ISO and it comes up straight away on the phone screen what it's changing, without actually taking a pic.. If that makes any sense? Really handy for luna photos. I also have SkEye Pro, the push-to app, but having trouble attaching it to the dob without to much magnetic interference. If I could get those 2 apps working together I'd reckon that'll be a pretty cool combo

And yes, we all know what those "other" reason's are