I understand the diference in the systems, my comments were made based on what I've heard from guys with the actual vehicles as well as what I've read in various trade magazines. I understand that the urea tanks have heaters, etc to keep them from gelling when in operation, but how long and how much battery power does it take to thaw out a gelled/frozen urea tank on a parked truck. if you need to go from point A to point B in cold weather how long is it going to take to thaw out the tank before you leave, or are you going to no choice but to plug the vehicle in overnight to keep it thawed. Maybe it's not a problem for a semi in a truck stop or a homeowner in their own yard, but it's a major problem for guys like me that work out of town and park in motel parking lots or in some cases the vacant lot next to the motel lot because it's full. Even then I've only seen one motel in my travels that actually had outlets accesible to vehicles in the lot....and then they had to run their cords across the travel lane to get to their trucks. In other words any water based product is going to be a problem for ALOT of people come winter time.
As far as the particulate filters I've heard numerous problems on them from a friend that works at a dealership. Everything from premature plugging due to alot of starting and stopping (ie garbage trucks, busses, etc) and the vehicle never really being under enough load to get the exhaust system hot enough to self regen. Then they came out with the fuel fired regen systems that have to be kept in use once they start to regen or they don't complete the burn and subsequently cause problems.
Like I said I don't claim to know everything about all of these systems. However I do know the basics of how each works or is supposed to work and between that and the problems I've heard related to me they are all one HUGE, EXPENSIVE, PITA........
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