I have two Sena's. One thats the integrated system in the Shoei Neotec II and a later edition using their much lauded 'Mesh' technology (the 20S and the 50S)
The reviewers said they were the best. I'm not impressed with either. Costly, glitchy, difficult to update, dodgy connectivity and ultimately bad for your hearing health. Wish I hadn't wasted the money. The integrated system in the Neotec adds weight to the helmet and is another bloody thing to keep charged.
I would for the sake of protecting your hearing not bother with any helmet system. You are left either not wearing ear plugs or turning the volume up to max to get to an audible level. Neither of those solutions is going to do your hearing any favours.
The safest and most reliable source of sound are moulded earplugs with speakers integrated in them. This blocks damaging engine and wind noise and allows you to keep the volume down whilst it still being crystal clear. That also saves draining your phone battery.
Moulded plugs take a bit of getting used to and are more faff than an in the lid system but no charging needed and what price your hearing?
If you go for the custom plugs (they are not cheap) then make them note you want them cut down as low as possible, this will help with adjusting to having solid moulded plugs in your ears.
I've used two different companies for these types of ear plugs. One was shite the other good. If you want links let me know and Ill try and find out which one was which!
If your feeling determined to go down the in the lid route I'd have a look at amazon reviews as there are much much cheaper alternatives that people rave about. Cardo is a popular alternative to Sena but still pricey. Having had my fingers burnt I wouldnt go down that road again.