Marvintpa

Good luck with your request.
For some reason I don't understand, the amount of information and talk about the Sentinel has been surprisingly small - I think there was more talk about it before it was launched.

There are a few threads on RBW, but not much.

I haven't had mine in current yet so can't comment on that, but overall breathing resistance is very goood. Build quality and ease of use are good. The canister is a little different for packing and inserting, but not bad. The quality of the machining is excellent, and the electronics are some of the best available.