Recs.
Updated
SpecsUpdate
Pros
Pro Straightforward interface
The interface is very simple, fast and easy to use. WhatsApp does a great job of focusing on the basics behind messaging. The app is simple to use, fast & very polished. You can start using it as soon as the app has been downloaded - it does not require setting anything up or registering. You can communicate with anyone in your contacts list that also uses WhatsApp. Includes useful features like seeing when a contact is currently available or typing.
Cons
Con Shares meta data with Facebook
WhatsApp shares your messaging meta data with Facebook if you do not opt-out in the settings. If you use the same phone number for WhatsApp and Facebook, the profiles can easily be linked.
See https://www.whatsapp.com/faq/en/general/26000016
Con Account is limited to one device
You cannot use the same whatsapp account on multiple devices (e.g. a tablet, a PC and a cellphone). The account is tied to the device with the specific cellphone number. That also means that there's no sync since it doesn't keep conversations when switching operating systems or devices.
Recommendations
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Flagged Pros + Cons
Con Single device
You cannot use the same WhatsApp account on multiple devices (e.g. a tablet, a PC and a cellphone). The account is tied to the device with the specific cellphone number. Chat history is deleted when you sign in to a new account, unless you have created a backup.