Has any one used a Sigma 100-300mm F4 before. (100-300mm F4 DG EX IF / IF HSM)

It is recently discontinued lens through Sigma, but it fits my needs spot on.

I can still get it. I have looked at the Canon 300mm L F4, Canon 400mm L F5.6 and also the Sigma lenses in 50/120/150 - 400/500 ranges and feel that the 100-300 DG lens (DG for FF Body) would be just right on my APS-C (160 - 480mm equivilant FOV)

Looking for any feedback on this lens if you've used it.

Thanks in advance.