I love mine. I have an HJC brand. I don't remember the exact model. Just like you say - flip up while filling up, to chat, and since I wear glasses too (full time), it's MUCH more convenient. I put it on and off just like an open face helmet. No need to take my glasses off and on, trying to get 'em over my ears, etc.
I've never noticed it to be particularly heavy or un-aerodynamic, but I never ride with the chinbar up.
It was inexpensive yet fit me very well, and that's the main thing, beyond the DOT / Snell cert, which they all have anyway.
Enjoy.