I'm not saying that you're unhappy now, im just saying that in the near future the battery life will be even worse, not long after that you'll have to throw them away despite them being in a fully working condition.
If you use them frequently each day, and have to get 2 charging cycles going each day I don't think it will take too long for the degration to show its effect on that intial low battery life. Meaning you'll have to charge them even more.
Nonetheless it will be really interesting to follow
Either way, it's a major win for B&W, this must be a dream product for them when it comes money, they're essentially selling a disposable wireless IEM for 400 EUR.