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Pros
Pro Allows complicated gestures
Hammer.js lets the developer make 2 (or more) gestures depend on each other so the callback will be invoked only if the 2 happen at the same time. It also allows listening to a gesture in a specific direction so you can listen to right/left/up/down/horizontal/vertical/all gestures accurately.
Pro Great gesture info data
Hammer.js gives access to a long list of event data fields such as X/Y velocity, position, direction, offset direction and more. List of all Event object fields
Pro Minimalistic
Hammer.js gives the developer the minimum essential functionality needed to support all main touch events but that functionality is all one needs to create great user experience.
Pro Lightweight
Hammer.js is only 3.98KB minified, which results in only a very small impact on load times.
Cons
Con Some browser bugs and fixes are available but not explained
There are some browser specific bugs (such as this Chrome 55 bug) that has a relatively easy fix using hammer functionality but is not found anywhere in the docs which can cause frustration and time waste.
Con Documentation is ok but not great
The docs are great for a very basic use of the library. On more complexed use the docs are not always enough as some of the functionality is pretty complicated but is not explained well enough which can cause things to not work as expected.
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