I really love my two Flares. I was lucky enough to pick up the first one on a Lightning Deal and then that deal was repeated on Prime Day so I grabbed another. they sound good on their own but amazing when paired in stereo mode.
Like you, the lights weren't a factor in my purchase decision, but I ended up really enjoying them. The lights don't truly remain synced when using two speakers together though.
The Flares and my Anker Soundcore Sport are both used primarily for music, but I picked up my Anker Soundcore primarily to listen to podcasts when I'm cooking and I also use it for lengthy phone calls. Still love the battery life on that thing--I get far beyond the advertised 24 hours.