I have the first one, but branded something else.
Great bottle opener, good screwdriver which fits PH2 perfectly, and the design is also nice. No 1/4" wrench slot for a bit, though.
I would say it is not ideal for keychain carry. Too long.
That middle one looks nice. Maybe a bit pokey, but with the carabiner, you can take it off the keys to do something, and put it back on again when you're done.
I have a clone of the CRKT. The real thing will be a lot nicer. The one I have, I did not like. No edge to speak of, the 1/4" wrench does not fit 1/4" bits, the screwdriver tip is too wide for PH2, and when you use it, the point of the bottle opener digs into my finger.
I carry a NiteIze QuicKey on my keys. It cuts well, the driver fits Phillips 2 screws, and it is comfortable to use.