Work well? Absolutely - best portable I've ever had.
Hold up to the test of time? Also very good. I have had a couple of control valves go out (my own fault, see below) and Weber sent no cost no shipping charge replacements in a couple of days.
We use the folding side tables.
1lb bottle about 3.5 to 4 hours on full tilt
And now a note about the control valves. My neighbor and I both had this happen to us and both were able to get replacements, but if you are careful you can avoid it. Apparently when you use the adapter hose to a larger tank if you do not open he valves in the correct sequence you can put the control valve into "leak detection" mode, where it will allow only a minimum of flow through no matter what you do. In order to avoid you have to ensure you pressurize the system by having the grill valve closed, line connected, and then open the tank valve - wait a few minutes for the pressure to build, and then finally turn the grill on - or at least that is what the Weber folks told me on the phone. Opening the tank value and the grill valve at the same time might trigger the problem.
At any rate they sent a replacement valve right away because once it got into the "leak detection" mode it would not recover, even with the small bottle attached. FWIW they told me this condition cannot occur with the small bottle.
Anyway that is the only problem I have ever had the WeberQ and Weber fixed it pronto. I have the large (non portable) model for home and the 220 for the road. I think it is fine to use the adapter hose just as long as you open things using the correct procedure.
Happy grilling!
Greg