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The only other option is to not have the extended battery life... or to tape a battery of your own to a strap you like. If you want a professional grade, non-DIY solution, this is the only option.
What it helps with: It gives trackers extra battery life. It'll also work for a GoPro, though, if you can mount it to the 1/4 screw. These straps are also straps, so they help with strapping things, specifically trackers, to your body. You can also use them for strapping something to a large pole or plank, but they will not work for anything small, like a carbon fiber maul stick.
What I found a little disappointing: The straps themselves are a little uncomfortable compared to my old straps. I bought a $30 bundle of straps for my trackers which didn't have the extra batteries in them. They were incredibly comfortable. These battery-filled straps are nowhere near the same quality as those other straps and I can tell the difference right away. I find myself having a hard time ignoring the extra weight on my ankle straps, too. These batteries are very lightweight, but I guess every tiny bit of weight is noticeable when you're going to wear it for a long time. The USB ports of the batteries on these straps are also an extremely tight fit. I have some trouble getting 2 cords next to each other so I can charge the battery and the tracker at the same time and not require an additional charge cable to the wall. It works but it could be a lot easier to manage.
Overall opinion: Get it. It's your only semi-decent option if you want to do full body tracking for extended periods of time. It also really does add a lot of time to your trackers. Good product at a somewhat expensive but ultimately necessary price. Worth it.
It's okay at best. Great idea, poor product quality. One of the batteries is already starting to go bad after a month and a half and two of the cables are extremely loose and constantly fall out or just flat-out fail to make a connection when plugged in. This company seriously needs to hire a better QA team because the quality of this product is NOT worth $100.
I love using full-body in VRC, but it was always stressful keeping an eye on tracker charge or having to stand almost on top of my PC to plug them in and charge while playing. I also was previously using what were basically just velcro wire-management straps to keep these things attached to my body.
These straps fixed both of these problems completely. They're comfortable and the battery lasts for ages. I have no idea what one or two of the other reviews are talking about with stepping on plastic. I suspect these people are wearing it wrong. If you're wearing it correctly, the plastic ring will be on the inside of your feet (left side of right foot, right side of left foot). This will keep the ring on the side rather than sliding underneath like what would happen if you were wearing them reversed.
My only real complaint is that its a little difficult to get the charging cable in sometimes. Would also be nice to have an "off" switch rather than having to unplug the spiral cable from the trackers every time I'm done playing.
If you are someone that is on VR for a lot of time I recommend these. I personally use them for VRchat and they last me the whole day, sometimes until the next day. My only gripe is that you can't remove the battery that's inside the belt, but I don't see it as a deal breaker, it's just unfortunate.
If worse comes to worse, you can always purchase their separate batteries for $20 and are compatible with the older trackstraps that Rebuff sells without the batteries. I even bet they are compatible with other straps as well.
Ive used them for a few days now and they are great. Now if you have small feet like size 4-5, might be a bit loose and youll notice the straps sliding off to the side of your feet even with shoes on. Then again, I am dancing vigorously in full body for VRC. Definitely worth the money for the amount of play time you get and I find the quality better than the other $50 straps that I have bought. Your full body will last twice as long as your controllers and on the box, unlike the rebuff reality website says up to 10 additional hours of playtime instead of 8. Get them, you wont regret!
Update: (hence why I took a star out) One of the battery does not charge anymore. I have tried changing USBs, switching between trackers, and I am still confused. I can charge both separately and see that power is in them. I have tried seeing if I can charge other items with the battery pack and it will not charge for some strange reason. Went on support page and tried updating my stuff, and still not working. Well, it lasted 3 months ish, but I hardly wear full body after a month of having it since I am too busy to get on vr nowadays. Had been using it 1-2 times a week, occasionally dancing. I still think its completely worth every penny tho and plan on ordering another pair as backup once I have time to be in VR for long periods of time again.