Hem.
Who did you purchase the doran through.
Was looking at a tyre dog but these look good to....
Renno 
Sorry for the delay Renno, we are on the road at the moment.
Bought it through Doran, good service etc... I am having some issues with picking up one signal from the CT, I believe that the problem stems from my set up [the BT50 has a custom made canopy that is blocking it] so I may need a booster. Not a big issue but will sort out when I get home.
As for the rest of them, they are working a treat, alarms for both LOW & HIGH pressure, plus each tyre can have an individual PSI set.
Regards
Hem