A bit late to the party, but I agree with the above.
There are no good credit card one piece type tools on the market. They are all crapola.
That having been said, the SwissCard series from Victorinox was good, although kind of bulky for wallet carry. Ditto for the slightly lower quality (but still quite good) TooLogic cards, although as Steve Padden, the owner of TooLogic was a perfectionist, I don't know how many actually made it to production and distribution without being recalled.
He eventually retired and sold the company to SOG, which was run by Spencer Fraser, who was more of a goodenoughist and I think they released a few models under the SOG brand, but I think they were also short lived.
The only other one that I can think of that would have been worth mentioning was the Axem 4.0 from Steel Life in Italy. It isn't a credit card tool in that it is quite a bit larger than a credit card, and likely wouldn't fit in your wallet. Also, it has a few jaggedy bits since it's a survival tool and not an EDC tool, so I wouldn't suggest keeping it in your wallet anyway unless you want a very awkward visit to the emergency room.
Someone will probably mention that monkey shaped card and claim it was good, but trust me, they are mistaken. Just because it's slightly better than all of the other crap on the market doesn't make it good!
Def