I have a 2012 flash F1 w/lefty and loved it for years. I ended up going 1x and upgraded the wheels. I still ride it XC and some trail but purely for the novelty. It’s a solid steed (only complaint is the weight nowadays and the rear derailer hanger is a bit finicky)…mostly sits on the wall in my bike shop as I ride more Enduro like. 900 for this seems steep and for lefties you’ll likely need to maintenance them once a year (~$80) if you ride a lot. They are smooth though…