Thermobore is good stuff, doesn't swell up. When it's new, it sticks together until the hose has been used for some time because it has a very smooth exterior unlike normal mini/micro hose. It's harder to reel in to start with because the hose is much stiffer with the third layer until it's been worn in through normal use.
Varitech's special mini/micro bore has a rubber inner layer which absorbs heat from the sun in the summer better than original hose but loses heat more than original stuff in winter from heat lossed through lying on the ground.