As you can see here and mentioned before, the straps are in the way of the power slider and the SD slot. The SD slot is not an issue overall as most do not use it. But, the power slider being covered by the trap is a major issue and one that will stop people frm buying it or once bought, wanting to return it.
Also, you can fix the problem is the clasp as well as the straps by instead of using the straps and the clasp, hook into the cover holes on the 650. Then you can do away with the clasp and the straps. Making the connectors out of something not plastic would do fine.