We just bought Mrs. Obo a new Neotec2 with the built in (extra purchase) Sena SRL mesh comms a few weeks back.
I guess it will be 2 years this December that I've had my N2 with a separate Sena 50s. I wanted to be able to move the Sena to another helmet when I choose, although I've not done so. There are *some* other limitations with the built-in unit, I think one is that there's no external headset jack if it's in the helmet, whereas I can plug my Etymotics wired earplugs into them, which is what I prefer. My out-the-door price for the N2 and 50S was just under $1100 USD at Cycle World, and the nice counter guy even installed it in the helmet for me.
I tried the in-helmet speakers years ago, but they do not sufficiently reduce wind noise. Might could hear audio with sufficient volume, but then your ears are being assaulted with unnecessary additional decibels, in my non-medical-practitioner opinion.
What I will say is, it's good to have choices. I've found what works for me, and I haven't even tried to sync the Sena with my BMW's TFT or Nav system. It would be ideal to be able to control tracks, playback and volume with the Wonder Wheel, but it can be quite fiddly to accomplish because of the specific sequence required for pairing, having to redo it all over if you lose connection, the firmware updates for 3 or 4 pieces (TFT, GPS, Sena and your phone), so I haven't bothered with all that.
Should I ever have a half-day with the problem of finding something to do, I may actually attempt it. It's discussed at great microscopic length over on ADVrider.
Lastly, with the Shoei new ratchet buckle replacing the traditional d-rings, I saw at Barbers a Neotec 2 locked to a parked bike with the helmet lock which uses a T-shaped bar (there are many makers of these) to go through the rings... but he inserted the T-bar right through the ratchet buckle, and it fit perfectly from what I saw. I thought I wouldn't be able to use that style helmet lock with the ratchet style, but now I'll have to try it. I have a helmet lock I never installed, before I bought the N2.