The Topeak Mini 9 is a great tool for most bike riders. It's minimalistic, and can handle the most common repairs. Not suitable for mountain bikes.
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Pros
Pro A compact tool for the most common repairs
The Topeak Mini 9 includes seven hex bolts, a Torx bolt, and a Phillips screwdriver, and it is suitable for the most common roadside repairs. It's lightweight and compact, while allowing for enough leverage to open even stubborn bolts.
Pro Lightweight yet sturdy
The Topeak weighs only 0.2 lbs, and it can be folded up like a Swiss army knife, which makes it ideal for travel. Despite it's lightness, it doesn't feel flimsy. The tools are made from hardened steel, while the handle body is made from aluminum, making for a great balance between weight and durability.
Cons
Con Not for off-road biking because it lacks a chain tool
The Topeak doesn't include a chain tool, which would be needed much more in off-road riding than road and city riding.