Let's see. You said an Evolution will easily out last an ABN OS. Evolution has only been around 5 years or so and OS has been making ABN for over thirty. Can you tell the future?? I have an OS45FSR ABC (ABN) that I bought in 1980. It is still running strong with the original piston and cylinder. Only thing ever replaced was the bearings. You don't even know if an evolution will last ten years. there is no history of them. For my money I'll take the oS over any Chinese engine any day. Except for the OS LC3, the #8 is OS's hottest plug, right up there with an Enya#3. No colder than a Tower.