TubeNet

Does anyone have any positive/negative feed bach from these?
And if they are good... does anyone have one for sale?

Yes really good mouthpiece , comfy , good flexibility , good in low middle and upper register.
price ok £70 UKSterling , delivered in quick time from Mr Tuba ( good try before you buy scheme).
get a brand new one , better off then buying a 2nd hand mp...