I have the Neotec II and the integrated SRL2. I thought I wanted a Schubert C4 but my head isn’t the right shape for the Schubert’s. I love the Shoei helmet, and I think the headset is fine with the exception of the buttons as has been noted. I have the RC4 remote and it is ok but not great. Small buttons and it slides around a bit. I had been trying to use the iphone/nav/helmet together so I could control music through the nav/WW, but the Bluetooth just never lines up right with one of the three invariably not connecting. I put a quad-lock charger/mount on the bike and now my phone is where I can see and reach it, so I just have it linked directly to the helmet (phone directly to helmet, nav linked to phone for traffic updates etc) and everything works way more reliably. I am not using the remote now. I wear Pinlock hearing protectors while riding and the music/phone still sounds fine to me, but it is entirely possible I have low standards in this area.
I suspect from comments on the forum that there are other helmet headsets that are probably better than the SRL2, but I liked that it was integrated into the helmet and I wasn’t looking for audiophile audio quality or extensive helmet to helmet comms, so I am happy with it. Upgradability could be an issue as you noted, it will be interesting to see if they update the SRL to a version 3, and if it can just plug into the slot for the V2.
So I guess that was a long winded way of saying that I have both and like them. 😎