I have 2 runs; 50' of 1" ThermalTwin (to detached garage/shop) & a 85' run of 1.25" ThermalTwin (to house)
...I can't remember the exact price I paid, cause I got all the tubing, fittings, ecoflex and controls in one monster purchase, back in 2010 or 2011. All told, I could have brought a bright shiny new truck, of a fancy heating system. Wife likes the warm floors, so I think I made the right choice (for now)
I could not tell you what I run for a delta T thru the pipes, but I have had no complaints other than that week it was -40f, garage had a hard time keeping up (found out later, pump for that side of HX was set to low, next winter I set to medium)
But like everyother pre-insluated pipe, its not fun to wrestle into the trench; even though I dug it all in before pouring concrete