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Pro Its specialized straps are resistant to pool chemicals
The normal straps of other products not specifically designed for swimming won't last when swimming 5 days a week for months. This one will endure that kind of training with no problem.
Pro Easy to use
There are a lot of youtube videos that explain how to pair the device and use it.
Pro Garmin will replace your strap if it gets worn out
Con No live monitoring
Most digital trackers can't transmit while in water, and this one can't either.
You will have to wait until you are out of the water and the file gets synced with the watch to analyze your performance.
Con You must have a Garmin compatible watch to use this strap
The strap is only the sensor, you must also own a FR920XT/Epix/Fenix3 to be able to download the data it collects. It won't work with watches from other companies that are usually able to download data from the straps either.