The best thing I like about this framework, it's very easy to learn as well as use for development purposes without much hassle or learning curve involved.
Also, since its open source there are many resources available online which can be helpful in case of any query regarding usage. There isn't anything particular i dislike at moment but would love if they have more documentation/tutorials with examples so we don't need to go through trial-and error methods while using their API services. We are developing an application where our users will interact with other clients via chat platform such as telegram etc., hence it was important for us to develop something similar to WhatsApp Web SDK.