Ok I have 50/50 now. Tekno rears and MIP fronts....
For me the Tekno's are the winner. Much easier to install and definitely lighter. The MIPs look (only look) more substantial but at the end of the day neither are very visible unless you are inspecting them.
The Grub screws on the x duty MIPs that hold the shaft to the diff are silly. I can see why people buy the HPI grubs screw with the bar as per the stock mounting screws to replace them. I also think the Tekno shafts will need a lot less maintenance.
MIP X-Duty: 8/10
As I say just my opinion but if your not already on the MIP bandwagon look at Tekno. They are cheaper and also allow more control of the wheel toe in.