In use, the cartridges are of course practical.
You can grill with a cartridge on average about four times.
Since I grill often and me the price of these cartridges is far too expensive, I switched to bottled operation. That was in my Q100 fortunately no problem. (One does not need the original Weber Conversion Set I -. Like many others -. Taken a 150 cm hose with a suitable pressure reducer, which was also available here online at Amazon without complicated conversions, simply screwed Proper screwing note (.! !!), check that no gas leakage and ready.)