I purchased the Givi tank lock ring and the mini bag with the hard shell and phone holder built in and I absolutely love it! The mechanism for installing and removing the bag is second to none. This bag drops on extremely easy - I think you could do it blind folded and the release is just as simple.
The bag is small, but I like that better for aggressive riding, and it is surprising how much you can actually pack in even a small bag. The phone holder is better in fantasy than reality. It is designed for a medium size smart phone or smaller. Large smart phones are a very tight fit and difficult to insert and remove from the pouch. I had to cut the bottom of the securing pouch on the back side of the lid to allow the phone to slide in a little deeper and have the screen centered. Surprisingly, while my screen won't work with gloves directly on it - it does work with gloves through the bag - not sure the reasoning for that one. However, the screen faces directly towards the sky and this makes washout from the sun almost a guarantee any time of day.
Ultimately, I haven't been using the phone pouch because of the issues noted above; however, I still find the bag perfectly sized and extremely handy.
