The F6 only existed for one year - 2008 (in the USA anyway)
It was one of the first made in Taiwan frames, and was good bike at its price point.
I bought 2, one for each of my kids back then. I might be wrong but seem to recall about US $500??? That was whole bike - it was not available through normal channels as frame only as a far as I know.
I think my son's medium weighted about 28 pounds - again, whole bike, stock.
He upgraded the crap out of it - converted to Lefty, disk brakes, nice wheel set etc.
He still has it and it's a great bike.
It's probably the least expensive frameset that will take a lefty or headshok. The welds aren't as pretty as the made in USA ones from that time, but other than that - it's great inexpensive frame that gives you lefty/headshock potential.
If you don't go lefty/headshok, you'll need a reducer headset or something like that.