They aren’t as good as the first as far as the music goes. Not tested any Metal. Some music is ok. The vocals being more present are not what I need (Sometimes, depending on the singer). I like to feel the music. The bass is there but it’s not deep and booming. I think I got used to my OGs. If yours have no bass then perhaps they’re defective? Do check reduce bass isn’t enabled, I’ve heard some people set them up and it was enabled and they said reduce bass was no bass at all. Others have said the vocals stand out too much. Everyone has a different experience with them, which I always think is based on expectations and comparisons to what they had previously. There’s 2 less tweeters in these compared to the OG. But as I also said, placement matters.
As to any other issues with syncing I’m not experiencing that. One improvement is being able to connect to AirPlay a lot quicker. My OGs took so long , the song was almost over.
They do stand out using with Apple TV 4K for movies. I do recommend testing for home theatre if you have the set up. With the 2021 or 2022 Apple TV 4K you can use them (or any other HomePod) as an Audio system for regular tv watching because the eARC turns it into input & output. (The tv needs the ARC port). They might beat out a Sonos Beam for sound on that.
Either way they still have a cult following and there are people spending up to $200 on an OG! I wouldn’t by a used one but I wouldn’t sell my OG either. Unless it completely dies because people will even buy the broken ones.
I hope you can get this sorted out