We bought a Magma Trail Mate grill for our last outing and had unsatisfactory results. For very lean meats, the grill worked great, but we had a terrible time with flame up on burgers or fattier cuts like ribeyes, even with the valve turned all the way down. The problem got worse over time, and on the last day of the trip, I began smelling gas with the valve off - so it's likely that the valve wasn't working properly from the start. I suspect that this may be a general issue with the Trail Mates, since Magma now offers an upgraded replacement which they refer to as an extra-low output valve and for which they charge $37.98.
I'm not at all happy with Magma's response to my problem - when I called them to get a replacement regulator, they brushed me off and told me to send the entire grill back to where I bought it (even though I purchased it two months ago and the return window was only two weeks). Uncharacteristically, I wasn't in a mood to argue; and fortunately, the store I bought it from was understanding and will replace it - though I do have to pay shipping for the return - and undoubtably, the replacement unit will still have the older valve, so it's likely that I'll encounter the same problem again and will have to press the issue with Magma anyway.