It's awesome.

Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week

Okay the ring itself is quite large. I can imagine it won't fit for certain people since it's too loose. I'm quite a big guy with strong hands and can fit it on all my fingers. For me this is a pro. Opening bottles with a ring around the pink didn't seem like a good idea...
The metal is very solid and decent. Opened about 10 bottles so far on my last party and it's still in mint condition. Great!

For some this might be a con: it's quite large.
Also the skull... didn't like it a lot. But some might love it. You can always remove it or paint over it.

None, maybe get some other designs.

For parties this is great. It looks fun to open a bottle with your hand, lot's of people don't realize what's going on.. If you like parties and lot's of beer or other drinks from bottles are consumed, get it. :)