This multitool is ideal for mountain bikers. It's very versatile, good for home and roadside repairs alike, and has a lifetime warranty.
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Pro Great for both home and roadside repairs
The Crank Brothers m19 multitool has 19 tools- a chain tool ( 8/9/10 speed compatible), spoke wrench ( #0, 1, 2, 3) hex wrenches ( #2, 2.5, 3, 4, 5, 6, 8) open wrench (8mm, 10mm) screwdrivers (phillips #1, phillips #2, flat #2) torx (t-10, t-25). This will cover nearly all your repair needs, even chain troubles. Since it's a lot more compact than a full tool kit, it's far easier to carry with you anywhere you go.
Pro Great for off-road biking because it has a chain tool
This multi tool has an excellent chain tool, that's compatible with the most common chain sizes (8,9 and 10). This might save you a long walk home in case anything happens with your bikes chain.
Pro Comfortable to use even with gloves on
The tool is slightly smaller than an iPhone 5, and it has side grips. Even when using it with gloves on, it'll give you enough leverage and won't slip out of your hand.
The tools on the m19 ar made of high-tensile steel, which will last for years without chipping, and they won't damage the bolts on your bike. It also has a lifetime warranty, and if you store it away from water, it will last for many years.
Con Difficult to open/close case
This tool comes with a carrying case, which is a nice addition, but the lid on the steel case is difficult to open and close.