Yes

Doesn't work anymore.

It hasn't worked since the beginning of the year and it looks like they gave up on it to fix it. Completely useless add-ons.

doesn't work for Twitch, like advertised

Addon used to be great but it hasn't been functioning correctly since the start of this year. The addon used to show emotes in chat , it used to auto accept channel points ect and it doesn't do this anymore.

Not anywhere near as extensive as FrankerFaceZ, but it has some useful functions that FFZ lacks, in particular ability to join chat anonymously. I use both BTTV and FFZ for different reasons and they don't conflict with each other, both great extensions on their own.