As long as the level 10 is working fine there's no need for eyes. I sort of gave up on mag's when a secondhand RT we got turned out so bad about 6 years ago (the shoot up as the valve heated and the level 10 seemed to go off very quickly - didn't have a regular air supply outside of the site we went to at the time so it was probably a bad idea from the start), this one's inspired me to start looking at them again though. Is the x-valve any more efficent than the classic ones?