Tamron Adaptall SP 300mm f5.6 lens

[wolfeye]

I've recently picked up a couple of nice-performing Adaptall lenses. While looking around to see what's out there in this universal mount, I read some high praise for the 300mm SP lens. Unfortunately, the images I've seen online given as samples from this lens have left me thinking the lens is very overrated.

Does anyone here have this lens and could share some sharp pictures from it? Macro or otherwise.