double glazing- anyone got liniar flush sash windows - do you recommend?

[tropicalfish]

I am trying to decide between evolution flush sash and liniar flush sash. I have seen that liniar flush has brushes on the inside and I wonder if you have had any issues with them. Also if you are against flush sash window products please do also tell me why.
Many thanks
TF

Hi there,

Mind me asking what you went with in the end? We've the same predicament.

Thanks