I have a set of the PB Swiss standard allen keys that I stole when I was working in Switzerland. 10 years later and they are still used week in, week out.
That said, I'm such a tart that I bought a set of the fancy hipster rainbow ones from Fred on the spur of the monent at Souths (alchohol may have been a factor in the decision making process). Since then I've impregnated my gf, so scientific fact time - the coloured ones make you irresistible to women.
brilliant!