I would love to test the Flare.
I think the best testing plan would be to take it to a pool party at my parent's house.
In order to test it, I would:
Connect multiple types of devices (phones, tablets, Apple, Android, etc.) to see how well it worked with each.
Crank it up while everyone is being loud and obnoxious to see how loud it could be and whether there was any sort of distortion.
Play some "bassy" tunes to check out the low frequency range.
Let it take a shallow dip in some water to test the water resistance.
Ask all the party members around the pool if they can hear the speaker to test the 360 degree sound.
Keep the party going into the night to check out the light show!
I'd share the review on Amazon and on my social media pages.
I'll look forward to checking out the Flare!