Hey! So I've never really been a fan of back massagers. They seemed more gimmicky than actually useful to me for a long time. However, at the start of quarantine I had to get creative and try new things to make up for the lost massage appointments, so I ended up getting a Hypervolt plus along with a Hypersphere in order to help manage pain. I got mine before they switched to this new bluetooth thing, but it's basically the same.
The Hypervolt fixed the biggest issue for me that I had with massage guns- before, I had never been able to put enough weight on a massage gun because the gun wouldn't be able to keep up, the Hypervolt keeps going regardless of how much weight I put on it. It also has a "pointed" tip, which was a massive plus for me.
Personally, I used it a bunch when I first got it, but I don't use it much anymore. This is partly because I don't usually have somebody to use it on me, so I'm contorted in weird positions in order to get the spot I want it in, so I've ended up using it more on my mother than I have myself. I still think it can be useful for things like your feet and your neck that are hard to work on, and my mom absolutely loves it, but otherwise even with how great this massage gun is, it's not the best pain management tool I use.
The Hypersphere I used maybe two or three times seriously, but my house is old and having to use it on the old wooden floor disturbs literally everyone in the house, and maybe even the next-door neighbors. Despite how loud it is on hardwood, the few times I used it, I couldn't find any noticeable differences in pain relief from a $10 massage ball. I kept it anyways because once I get into a new house I imagine I'll use it more for more specific muscle pain I have, but for now it sits on the shelf collecting dust in favor of my other pain management tools.
I would suggest if you're looking for something that has the same end result as a massage gun, look into a Theracane. The Theracane has been life changing for me (Literally.) and made my life so much easier. I go into detail about it here, where I also talk about massage balls and compare them both to eachother and a massage gun.
Take into account though everybody's scoliosis is different. It sounds like you mostly have leg pain than anything else- in that case, it may be very beneficial to have something like the Hypervolt or Hypersphere where the tool does the work naturally for you, instead of something like a manual massage ball or Theracane that'll be more difficult to physically manipulate to get at the leg muscles. For me, the Theracane and massage balls are godsends because 99% of my pain is my back muscles, and they're really good at getting at those muscles, but it may be a totally different situation for you if the pain is in your legs. If you're interested in other forms of pain management, I have a few suggestions here.
Despite how this subreddit is normally against it, I think Chiropractic is a good choice if you're with the right person. An extension of Chiropractic that I've tried is this new treatment called Scolismart. A lot of people around here are rightfully skeptical about it, it's a new unproven and sketchy treatment, but I saw minor improvements through the 2 week boot camp and other treatments I've done through them. After I attended, I made a post about my experience and what to expect, and I also talked with a lot people in the comments with valuable information. Do your own research and decide if it's an option for you, it is definitely less effective for older patients like us that are past our growing spurts, but if you're comfortable with Chiropractic it's not too far off from what you're already doing.
If you have any questions or need to talk, don't hesitate to pm me. I'm not sure exactly what kind of pain you're experiencing, but I try to help as much as I can.
Good luck :)