I debated over the Doran and the TireGard for several months.  Then a friend had a blowout on a STX1300 at speed and was lucky he and the bike survived with only minor bruises and rash.  This site has reviews of both.  I actually like the mounting and installation of the Doran but went with the tiregard last week because of the price (Doran is 50% more) and the Doran's 6 minute delay upon start up.  Read reviews here:

http://wingstuff.com/pgroup_list/tires/176_goldwing_Tire_Pressure_Monitor/

The TireGard is small enough to be a pain to mount and remember to remove every time but I like the temp function.  You can try searching the forums but the search engine here is pretty weak.  There have been several threads but I don't recall the Doran being discussed,

Good luck.