[Lililil]

It's the same one I have bought in Spain for 30 €.
The rubber edge and can throw. Replace it with some kind of thick and soft adhesive band, which put in windows that do not fit, or coated tubes air conditioning or what you find softer story remains the best edge.
The hand pump is a mess, I've replaced a air compressor connecting a pipe to the compressor inlet. As the compressor is too strong I made some holes in the tube so it does not suck so much.
The result is very good but requires tinkering.

Thanks a lot for your answer If I buy it, I'll modify the same way you suggested. As I understand, you haven't used NB and can't compare, yes?
I'm so impatient and really want to start as soon as possible