Have you checked out SoundBocks? https://soundboks.com. Source: about 1 year ago

I had a look at the SoundBoks this weekend at an event I was playing at. It had only a 10ms delay which was pretty awesome. This is out of your price range at 1000 USD, but mentioning here for anyone else looking for wireless portable speakers: Https://soundboks.com/. Source: about 1 year ago

Starting Monday, April 4 at 4PM CET/7AM PST—and repeating every Monday at the same time for the following weeks—we will make a limited number of batteries available for sale on soundboks.com through the regular product page. We’re limiting purchases to only ONE PER CUSTOMER. It will be first-come, first-served, and when the week’s supply is gone—it’s gone. But there will always be the next week :). Source: about 2 years ago

Honestly though, I don't really use many third party apps on the watch. I use HomeRun (along with the developer's other apps HomeCam, HomePass, and HomeScan), and I installed µBrowser for fun, but all the other third party apps on my phone that have watch versions remain uninstalled. I find that the built in apps do everything I need my watch to do, and for the rest, notifications being mirrored on the watch is... Source: about 2 years ago

Any thoughts on how this compares to HomeRun? Source: about 3 years ago

Try the HomeRun app: https://homerun.app/ . The developer has a beta for the next version going on, so if you contact him, you might be able to get on this beta: https://homerun.app/beta/. Source: about 3 years ago