The 300mm PF bare or with a TC attached is one of my three favorite lenses (the other two being the 600mm f/4 and 500m PF). I personally have never experienced the VR issues that cropped up in some of the early reviews. I'm sure if you do structured VR tests across a range of shutter speeds it's a real phenomenon but in practical terms I've never found it to be an issue and haven't lost shots due to the VR performance in the 300mm PF.
Personally I find it a great lens for light weight walking around but 300mm is a bit short for a lot of BIF work unless the birds are large and relatively close so I often have a 1.4x TC mounted to that lens when out in the field. The good news is it takes a TC very, very well. I've shot it a bit with a 2x TC which works pretty well on Nikon's mirrorless cameras but something I prefer to avoid on DSLRs as even the D6 loses a lot of AF performance when you mount a wide open f/8 lens which is what you end up with the 300mm f/4 PF plus a 2x TC mounted. Still the image quality is very good to my eyes even with the 2x TC if you can achieve focus.
One great thing about the 300mm PF is its incredibly short minimum focusing distance which makes it a very handy lens for pseudo macro work like Butterflies, Amphibians and Reptiles as well as certain floral shots where you get close, fill the frame but aren't at actual 1:1 reproduction ratio macro scaling. Add a TC and it's an amazing close work lens as it's focuses several feet closer than even Nikon's high end 300mm f/2.8 lenses. I've also had a blast with this lens for backyard bird shots where I'll just sit quietly out on the porch and watch the birds hop around the yard where they'll often come in much closer than they would out in the wild. The close focusing on this lens gets shots in those situations that my bigger glass couldn't as they simply don't focus at such short distances.
Personally I think Nikon nailed it with the 300mm PF and it's big brother the 500mm PF (and of course the newer 800mm PF Z lens).
FWIW, here's a few images from my 300mm PF, all with VR enabled:
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