Listening to an entire song without missing parts is impossible when using the Ultimate Ears Boom speakers together in Party Up or Two-Up mode

I have two opinions of the Ultimate Ears Boom speakers

First, the Ultimate Ears Boom app is a huge frustration

I really enjoyed the single Ultimate Ears Boom speaker I used on its own for about two years, but after experiencing the disaster which is Party Up mode and the Ultimate Ears Boom app, I will never again purchase another Ultimate Ears product