I'm green with envy :mrgreen:. I've tried the 300/4 out a couple of times in camera stores, and had a hard time giving it back to the clerk. I'll own one someday, but for the moment, I'll just enjoy the pictures you'll be sharing from yours. Congratulations!
Congrats, Scott! I think you'll really like this lens. It's not difficult to handhold and the shots it produces are great. This weekend I shot flying birds with a Tamron 1.4x and was amazed at how sharp they came out -- handheld at that! It never ceases to amaze me. Enjoy!