Depending on what you are using it on ie home stand alone cold smoker or a pit would make the choice a bit more one sided . Looks to be overkill in some areas with that big ol fan hanging off it and exposed to the elements. I don't know anyone personally that has the unit you are looking at so I couldn't say if it was worth the investment. Where's it shipped from? ( sorry haven't clicked the eBay link )
I would go with a simple , proven and robust smoke daddy if I wanted air assistd or the ProQ cold smoke generator for a drum or WSM sort of cooker.
Slappin that bass like some delerious funky preist!!!
UDS, Half Pint (Mini UDS), Weber, ProQ 20, Kegrilla
*250 gallon cooker- 'The Meat Beast!!'*
British BBQ Championships
Grand Champion 2008
British BBQ Society - Southern Championship
Grand Champions 2009