I'm a big fan of one piece tools. I just don't have the budget to back it up. Here is my first one piece, the Mega-Combo Wrench by Lightsource.
http://www.thelightsource.com/products/9/view(Beside a Waiter for size comparison)
It is about as wide as 3 Waiters stacked on top of each other and nearly as long as a single Waiter. It is *very* solid. Made from aircraft grade aluminum this thing weighs in at 1.4oz. It is light, tough, and very limited.
I've had mine for around six years or so and carried it all through college. I did theater and having a tool with me that fit all the various spotlights bolts was handy. Since I am now in the boring real world with a real job and don't do theater anymore, I do not carry it. It is big, bulky, and extremely focused...it doesn't even have a proper bottle opener on it!
However, when used for it intended purpose of adjusting theater spotlights it shines. I bought mine for twelve dollars and certainly don't regret it. I just can't justify carrying it any longer nor recommending it to many people.
(Also, my camera apparently sucks...I blame the wife for hiding the good camera)