The problem is that the levels are separated by 300m which is obviously not quite 1000feet. To make it all work in RVSM airspace you always need to fly on the Chinese table. Below the RVSM you are also supposed to fly on the converted table but you are never out by more that 60 feet or so and the improvement in flight safety is huge if you simply fly metres. Our aircraft displays both once we have selected metres so we usually select metres and cross check the feet if cockpit workload allows. Once you dial in a few thunderstorms and a couple of incomprehensible ATC transmissions the last thing you want is to accidentally read back an altitude in feet and confuse the crap out of them and yourselves. Each to his own but there are a lot less mistakes if you just use metres near the ground.