Thanks for this excellent information. The trade off, as I see it, is that the Nitro family is pretty much plastic...that is, the materials are of a lower quality than the more prominent brands, and thus, the price is less. Keep us posted on performance and parts replacements.
As to the durability of APC's, life expectancy should parallel running time. In the case of Polaris and Letro, their lifetimes are limited only by the frame life...everything else is a replaceable part! Actually, even the frames can be "exchanged". You should get two seasons of normal use before you need tires, tail scrubbers, bearings, etc.