The noise from the wheels has been driving me mad and I hate how the R6 sounds like a supermarket trolly. I have now replaced the wheels with higher quality 78A hockey wheels from some inline skates. They are much softer and almost silent. I still have some noise from the caster frame. I have packet it with grease and fitted some sound absorbtion material to help but over the next few days I will look to get a better caster holder for the wheels. The front foot is now working very well and once the spring is fitted should be almost perfect.