I biked the eastern section, between Greigsville (63/Genesee St) and Peoria Rd. It appears to be used almost exclusively by 4-wheel ATVs (except for winter).
I parked at the crossroads of Federal Rd and Craig Rd. Google Maps claims there is a trailhead at Dow Rd, but there is no parking there, not even enough room to get your vehicle off the road. This website says there is a trailhead at 63/Genesee St in Greigsville, but I can't confirm that, and the satellite imagery doesn't look encouraging.
As others have noted, there is considerable ballast, at least on this section. My bike has 4.8" tires, and I had their pressure at 4 psi. With that marshmallow tires setup, the ballast was still definitely annoying but not terrible. On the large majority of bikes, this ride would probably be bad.
The wooded setting was nice.
Regarding winter use: A ranger said snowmobilers use and even groom this trail.