It depends on what you are looking for, in terms of whether or not it is $1500 nice. Having the ability to do better deep profiling is really important and can easily save more than $1500 work of man hours right there. Some of the performance things can make or break certain kinds of games that are pushing the bounds of hardware (not mine). Once they ever finish their new GUI stuff, that would be worth that much to me all on its own. Etc.
That said, even though we bought two copies of 4.0, we still use 3.3 right now because of issues we had with the later versions. So go figure.