I carried a Swiss Army knife for years. High quality blade that keeps an edge, and excellent ergonomics of all of the tools. But it always felt like I had a rock in my pocket, and the blade is too small.
I carried a WalMart cheap rip off of the Gerber for a while doing theatrical work- loved the layout and the pliers, but the steel quality was crap, and could hold an edge for no more than 15 minutes. But it made me appreciate the value of keeping a multi-tool on my hip.
If your primary need is pliers, look at Gerber. They WAAY surpass Leatherman as pliers, BUT the blade (on most models) is small and awkward.
I now carry a Leatherman Wave. But I gotta disagree with anyone that says they are "as good as" dedicated tools. They kinda suck at all things equally. But they will get you by in a pinch for 90% of the time. That's all a multi-tool is supposed to do.
The Wave's blade is adequate length to be useful, good enough quality steel to hold an edge, and the blade can be opened quickly with one hand, as can the serrated blade. The pliers are a bit of a contortion to open, but simple enough to do quickly without looking. Screwdrivers, allen wrench, can opener all suck. Occasionally, I actually have use for the scissors. All of the smaller tools are annoying to actually open.
I don't carry it in my pocket- too big. I wear it on my hip, in a supplied belt loop that enables stowing the tool in it's folded position (knife), or unfolded (pliers). I always have it- I'm not dressed without it (don't try to picture it).
I use it every day, but only because every single day I am in situations where I need to solve a problem quickly without making the trip to the truck to get the "right" tool. But don't kid yourself- it doesn't do anything as well as a dedicated tool.
When I am in my shop, I NEVER use it, even though it is still attached to my hip. I always take the time to find the "right" tool.