You can't go wrong with Stabila levels and I personally love the Type R. I have a 6' and a 2' and will be replacing my other levels with Type R as needed. For me they just feel right in the hand.
It does depend what you are using them for, the bricklayers I know don't rate the Type R preferring the traditional 83s metal girder type but for me these don't suit working in peoples houses doing joinery. The Type R are more rounded with rubber ends etc so seem less likely to damage things when they fall over
I can't find the type R in 6'
I own/run a civil engineering firm so generally buy the heaven duty range, I believe the Superstar, I also buy quite far too many screed type levels they are 3-4 m and have a tendency to get stepped on or driven over by dumpersDo you recommend any particular model of BMI?