Those stutter too all the time, chunks of video get skipped, etc. If your link to twitch is not good enough, `livestreamer` won't help very much. Though this is infinitely better than twitch player that can't even hide its controls reliably.
One thing I'm sure is that it uses way less CPU and helps with my ISP throttling because anything 720p60 and above is a problem if I'm using a browser.
There are options to modify the buffer, reconnect and more but I almost never change my config except for hls-live-edge like once a year (for something that is not Twitch).