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I've had this battery strap for over a month now and the velcro straps are holding up fine. I'm using it with my Orzero Adjustable Headband and with the battery mounted on the back, the whole VR head unit feels more balanced. For my battery, I'm using a Tronsmart Presto 10000mAh Power Bank and get 6 to 8 hours of playtime with my Oculus Quest 2.
My only complaint and the reason for not giving it 5 stars is because the cable that came with it that plugs into the headset is not at a 90-degree angle. It's not a deal-breaker and only a minor issue but still would have been a solid 5 stars had it been at a 90-degree angle.