I cant speak on the Orion unit, but as to the price... The thousand oaks heater system was quite a bit cheaper than the Orion unit...
I got my Thousand Oaks heater unit here, and my heater straps for the M102/M90/ST80/C11
Overall I think it was $330 for the heater unit, a 2" strap, 2x 3" straps, a 4" and the 12"...
Thats a bargain in my books..