My 4500 came with Buzztv 4 and so did many of the ones I recommended/bought for friends. The BuzzTV 5 update you had to take by going to updates screen and typing I think "2015" which would get you the "beta".
My 4900 boxes, both came with BuzzTV 5 however.
Many who did not take the BuzzTV 5 update by using the code, eventually got it anyhow. My buddy never took it, and one day (over a year later) he did a reset on his box, and he called me in excitement telling me that he had just gotten an awesome update, and I should reset my boxGuess I had forgotten to tell him how to get it. Then he was going to reset his second 4500 to get it to update also, but I clued him in, on how to do it without doing a reset.
I have a 3000 also, and it still works well. The buddy of mine that I revived the Boomerang for, also has a 3000 which works well. He also has a Classic for his main box, but the 3000 and boomerang are now in the basement and in the garage, working quite well.