An "unsung hero"...
As 'C.Puncher' so poetically noted, Mercer is an 'unsung hero' in the mountain biking circuit! We rode both Saturday... and yesterday with Forrest (aka Mtngrinder)... both days for just over 2-1/2 hours and never did the same trail twice! Granted, there's not a lot of climbing, but great place for not only putting the hammer down and working on some technicals... mainly logs and roots, but it has a great tree maze (that can get a little monotonous after awhile... many places to bale however) to work on upper body balance and stability.
All in all, it's a great spot for winter riding as the trails hold up well through all sorts of weather conditions.
My personal recommendation... be sure to add Mercer to your winter riding list of spots!
Enjoy the ride!
LC