Swaro's USA warranty as written is pretty convoluted, IMO. It warrantees "the optical system" for the lifetime (product or owner lifetime?) for "defects in materials or worksmanship" when the product was purchased by US Residents from an authorized US dealer.
"All other parts" of the product are waranteed for ten years except "electronic components" are warranteed for 2 years from purchase.
The reality is, however, that SONA has a reputation of taking care of even used buyers of their products, as long as they didn't come through the gray market.
As to the OP's question regarding the non-HD ATS, I would prefer the Vortex Razor HD85 from an optical standpoint.
Also, there are no questions about the Vortex warranty.