When attached to a tripod, one of the most important things is being able to mount the phone exactly horizontally in all directions. This feature was missing both in my tripod and the phone grip.
This is how I improved my Shoulderpod G1 grip by adding a bubble spirit level.
I found these very cheap bubble spirit levels on Ebay that I bought. They were less that 3 USD for a pack of 10.
Then I took a pack of Sugru and attached one spirit level to the top of the tightening screw of the Shoulderpod grip. It was fortunate that the top of the screw was level when standing on a level surface. Otherwise this modification would not have been possible.
Now I can easily see that the phone is level when it is mounted on a tripod or other stand. I think the makers of Shoulderpod should add this feature to their grip. :-)