Their sound levels are roughly the same in my opinion.
No you need to make a mount since the sleeve is moving on the outside of The Handy. There are threads here in this forum with all kinds of suggestions on how to build a mount.
I don’t know exactly, but I think it has been out on the market since the end of 2019. I haven’t heard anything that indicates that new hardware is in the works. The manufacturer seems to be focusing on improving the firmware, improve integration with different software, services, websites to make the most out of the hardware and sync capabilities. The release candidate for version 3 of the firmware is out now for example and contains improvements that software can make use of to provide better experiences.