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It's very useful to have with how bad the vive trackers battery life is and they are pretty nice to wear too, the only thing is it's quite a lot of money. But it is worth it to spend that extra money over the regular TrackStraps for that extra battery life.
Overall a great product. Pretty sure I've gone well over 12 hours with these. Unfortunately they don't include long micro usb-b charging cables, so buy those separate. The spacing between the usb-a port and the micro-b port is a bit tight, so make sure you buy 3 micro usb-b cables which have slim heads to plug into the units to charge them (otherwise you'll end up unplugging the pucks from the batteries when you charge them). Highly recommended and well worth the price, I paid $150 CAD
Tip: the plastic ring on the feet straps can be uncomfortable to stand on (an issue if you have small feet). It's much more comfortable when you have the plastic strap on the inner edge of the foot rather than the outer edge. This hides the plastic strap in the upper arch of your foot
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.
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.
So this is more an inherent problem with velcro in general, but after a short amount of time the strap's fuzzy part started getting tugged away. I currently cannot find a way to fix or replace this, as the battery packs are sewn on, but the packs work like a charm.