I got the information from my sales guy at Embarcadero after a quarterly meeting happened.  If you look at DB Artisan you will notice that the different views in the application are actually web pages and it makes even more sense.  The word from Embarcadero at the time was that was the direction the engineers wanted to move in so don't be surprised if you see Performance Center disappear sometime in the coming years.

I have SpotLight from Quest but I have found it to be less than what I need (really, none of those monitors does what I need) so I fell back on DB Artisan and multiple monitors on my desktop which gives me the best of both worlds.  I am in the process of discontinuing my license(s) from Quest it works so well.