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RHC: Eric, I have had 15 years of experience with Paradox and have about 700 of their panels in service. Overall, they make a fine panel although like all manufacturers they have made their share of stupid mistakes. However, anytime they have, they've always "stepped up to the plate" and made it right. They are a young and progressive company, constantly bringing out the latest modifications to their panels. The downside to this of course is the constant learning curve that goes along with it. They are right in the middle with backward compatibility, with some of their newer panels not able to use the older keypads, resulting in the need to stock spare parts more than normal.
They sell all around the world, and have not concentrated much on the saturated US market. I could be wrong, but I have heard it said they are the biggest supplier of alarm panels in Brazil. They have a new "Stay D" function which hasn't caught on here in North America, but seems to be accepted in Europe and elsewhere.
Their tech support is VERY good. Their wireless is also very good, although they have had one small unit that was not so good. They have a range of panels from small to huge, with the largest are only applicable to large commercial customers. Overall, their product line is superior to DSC, another Canadian supplier, although programming is quite unique to their company. They don't seem to need as much service as the DSC line, and have none of DSC's propensity to have weird firmware problems solved only by "power down and power up and problem is solved..??"
They are not like DMP. Any dealer can take on their product.