Adding to whats already said in other replies:

Plus:

* is it tech i wanted before i knew it existed.

* tech clear on limitations / being unfit for case XYZ.

* community with low frustration levels.. where clear answers get clear questions.

Con:

* tech that is just the opinionated alternative of the month. Even if it catched on.

* tech website cant (or forgets to) explain solved problem in simple laymans terms.

* not actively maintained, must if facing external dependencies. (includes os, browsers, libraries, etc)

* docs are inconsistent/unversioned, or old versions are not kept available.