Unfortunately even the bigger pocket and even full sized multi-tools aren't really up to much.
They're great for the odd job every now and then, but for professional and regular use they're very very poor.
The smaller keychain style like the dime are even worse.
Not only are the tools ergonomically difficult to use for any more than a a couple of mins, the tools really lack any quality, the screwdrivers round off easily, the wire cutters blunt etc etc.
For the odd job and emergency use though they're just about ok.
I have the Leatherman Charge Tti
And the Sketetool CX
The Charge is the toughest i've found so far and the screwdriver bits aren't bad at all, it's still ergonomically terrible to use for anything more than a couple of mins, but then if you the option of the correct tool you wouldn't be using it.
Main problem with the Charge is the weight, there's no way i'd lug one around daily, it's a big heavy tool.
The Skeletool CX is a decent compromise, i carry this daily and it's light enough that i don't notice it, and although it has no where near as many tools as the charge the ones it does have are very useful.
I know knife laws are tricky, but i've been carrying the Skeletool CX for a few years now without any problems.
I think it'd have to be a pretty anal cop to say anything about a knife on a multi-tool or you'd have to be doing something pretty pretty to show up on their radar.
If it is a worry something like the Style PS might be worth considering
http://www.leatherman.com/product/Style_PS
It's small enough to fit on your keyring, has no blade and is harmless enough to be allowed to be carried on a plane.
You really wouldn't want to be using it for long though, ergonomically it's pretty rubbish and i said before the tools are pretty poor for tough jobs.