Pedro's tools are very durable... certainly not cheap metal at least.

I've never broken one.

It depends on what you are looking to fix - if it is just un-tightening and tightening Allen bolts on a new bike this should work perfectly.
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But if the bike is older and some of the bolts are rusted or seized this isn't going to get the job done.

While a good tool, you are likely to end up using only one or two of the allen wrenches on it, but since it has several, you are sure to have the right size for anything on your bike.

Certainly handy, since they are all attached to each other, so that you don't lose one or many.

This is a good tool for carrying on your bike while on a ride - that is if your bike is sort of new or well maintained (see my response to the similar question by John Smith (Is this a good for fixing bikes).
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If you are looking for something compact – this and the other manufacturers similar products are all good as stated above.
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If you are looking to build a set of tools for working on your bike then you have to determine what level and quality you want that set to be. This could be a start to a set but it isn’t a top of the line bike mechanic tool.