Summary: I could have a lot to say about this headstrap but will keep it to the facts. Background is I never liked the M2 versions with battery as they would slow drain my Q2 even with it connected. I just previously stuck with the M2 version without battery and would stick one of my own at the back of it. With comfort mods I did on that set up I really thought that was my endgame for Quest 2 and Quest 3. Until this came along.
Pros: - It comes with a build-in fan that you can granularly set the speed from 1 to 100. At around 60 and less percent the fan noise isn't too annoying over the sound of the game you're playing. I am a sweater even if I'm not playing intensive games. It doesn't cool very much but it does blow air around the top of your forehead area and depending how high or low you position that big fan on the top. - Finally BoboVR has added ratchet stops on the arm positioning. It's no longer friction based - but when you bend the arms or the back strap it has ratchets where you can click-position it and it'll hold it's place. This is very helpful for me so I know how many clicks it is return to my comfy spot after pulling the arms up to peek outside. - Also, due to the Q3 light weight and the ratchets stop I can even wear this headset without a facial interface like a Quest Pro. Very comfortable and good for MR games that you don't care if it's less immersive. - Battery B100 doesn't slow drain the Quest 3. Even with QGO app which "overclocks" your headset to play games with better quality or performance I've not experienced any slow drain. I was disappointed with the M2 Pro battery strap but not on this anymore. I even bought a second B100 ($62)! - Battery literally adds about 3 hours to your play time. Even with QGO app 3 hours is pretty good. I bought an extra battery so that I don't even have to rely on the Quest's internal battery, I can swap it after 3 hours and pretty much have unlimited playtime. - The two top oblong style head pads don't dig into my head anymore compared to M2 Pro. Seems they made the plastic very flexible on these. That translates to really good support on the top without the pain after a few hours. I even saw on a video you can take these off if you like - but I've never been able to on mine. - Back and forehead foam pads are comfortable. Very thick though comfortable and don't feel cheap. The forehead pad is a little too thick and warm to my taste but I understand it has to be that due to the fan. The fan does take care of that a bit. The back pad and the new design of the cradle at the back is very flexible and comfortable. - Pretty much these good features from the M2 Pro versions are back: The battery is very secure connected magnetically and has a satisfying sound when it connects or alerts you to no-battery. Comes with a good quality USB C to C cable. Plastic and materials are top notch, best that rivals the Quest's own plastic and color. Comes with a bottom part honeycomb back pad. - Since the arms and back needs additional force to move up or down, it's not really easy to move. Where you could use one arm on an M2 or M3, you'll probably need both hands so you can force it between the clicks. Not an issue for me as the trade off benefit is it's less likely to move if you don't want it to. Cons: - Only comes with bottom part of honeycomb back pad. I wish it came with top as well - I was planning to switch to honeycomb since I do feel it slipping sometimes though not anymore since I don't want to have half of each type. - PRICE! It's definitely an investment considering it's almost 1/3 of a Quest 3 128gb. You definitely need to read reviews and videos to understand the pros and cons. As I mentioned in my summary - M2 Pro was a fail for me for all my requirements. - The forehead pad is too thick. I often end my VR sessions with sweat underneath it, even if I'm relatively cool. I'm thinking of comfort mods and maybe using my old VR cover face foam to replace this. I do think they'll eventually come out with a model without the fan and therefore no thick forehead piece. - Some will complain about the fan, not me but here's my observations: It doesn't cool enough - just the top part of your forehead. It does get loud at 100%. Sometimes if you bend down, the exhaust of the Q3 will feed into the intake of the fan and deliver an unpleasant warm gust of air. Overall I feel if they remove the fan on a later SKU, it might be something I would have gotten.Though not anymore since this came out first. -