I built fake Factor O2 back in November 2020 to replace my heavy Merida Reacto 400.
The components I using for this build are SRAM Force 22, a Chinese handlebar, a Chinese lightweight wheelset, Schwalbe Pro One TLE 25mm, Fabric knurl bar tape, and Time Xpresso 2 pedal.
The total build-up is around ~ 6.8kg.
I'm not an expert to tell exactly how the ride feels on this bike. But what I can say it's night and day difference compared to Reacto 400.
The fake O2 frame feels so lively during the ride, stiff and fast to pick up the speed and yet convenient to use for a long ride. As for records, the longest distance I'm riding with this fake O2 is 220km, and countless 120km and above ride sessions.
To tell about the frame quality. Yes, it's may not the same as an original O2 but for a Chinese frame, it's high in quality compared to cheap chiner frames such as Twitter, Alcott, and Trifox. I've never experienced a creaking sound in BB area, slip seat post, and frame crack here and there.
I love this bike and will use it for a long time for sure.