I've quite a few of the Waves plugs that emulate hardware, but the "signature" ones that combine several processes into a single plugin with a few controls mostly unappealing. I can see why people might go for them as a simpler, quicker, alternative to learning about compression, eq and doing lots of experimenting though.
Mixcentre did interest me, because it struck me as a possibly useful short-cut tool, but having demo'd it I came to the conclusion that perhaps I don't really want the "Greg Wells sound".
And if he's being "very excited" in those videos he must be among the calmest, least excitable people on the planet :-)
As has been said, never pay full price for a Waves plugin, wait for it to go on sale. Unless you've a paying client that insists on a particular Waves plugin being used on their recording and you can add the plugin price to the bill and you're sure the client is good for the money.
Many of the Waves emulation plugs I have are no better than the plugins that come with Sonar Plat or the Cakewalk developed plugs like Concrete Limiter by the way. I got them mostly for use in Logic which comes with a much weaker set of plugins. Though I do sometimes use Waves Abbey Road set (though not the mic imitations), their exciters/enhancers and side-chainable multi-band comp in Sonar.