My opinion: no, not worth it. If you already have a surround system, then it doesn’t cost much to give it a go for a month or two. I have the Apple TV in my media room for apps like TCM, Brit Box, and others, so I would have that item anyway. Same with my multichannel DAC, AVR, and 7.1 speaker set up. But putting together all of that solely for trying out Apple Music Atmos I wouldn’t recommend. After having trialed it, I don’t find myself using it very often. I use my purchased and ripped physical discs a lot more. Mostly because I can choose the recordings I like best, rather than just taking whatever Apple is offering at the moment. The recording you want may or may not be available. It’s odd to me, for example, that The Who’s Tommy is not available in Atmos on Apple Music, even though a 5.1 mix has been out for years. Which I have, BTW, and enjoy. I realize there are technical reasons this is so, but that is a limitation nonetheless.
I’m one of those people that just has to try things for himself. So, having said all that, I myself would not take someone else’s word for it.