Sean I use the BVM UAT, I am very curious about the one marc sells from GBR. I think the idea is really good .I may try one of those on my next jet. I have only been flying turbines for a year and a half and have had no problems with the BVM unit . The GBR unit states that all bubbles will always go to the outside of the bottle and by taking fuel from the centre of a full hopper you will never get bubbles. I like the idea. I have never had problems with Bob's uat, but I like the GBR better.. I am also new at this though.