I would also recommend waiting for the revised adapter. Up to about speed 4.5, the longer adapter produces a reasonable amount of vibration. Above that speed, it becomes less acceptable. Some people don't seem to mind the current vibration levels, but why not wait for the improved version if you aren't in a big hurry.
The quick connect design isn't only useful for fast pad changeovers. It eliminates the potential problem of the backing plate coming into contact with the paint. It also provides two polishing sides per pad. You can use the top side to polish underneath objects like rear view mirrors, or you can have a custom pad made with two different foam textures.
On the other hand, a velcro backed assembly will allow you to switch between different manufacturers' pads more easily.