I am currently still running v1.8.2 on my production box, but have been tinkering around with v2.0.0.3 on a test box and so far, it is performing better than anticipated.
Some of the improvements take a little getting used to, but overall, I'm impressed with it.
I'm holding out just a tad longer to see what, if any, plugins might get updated to work with this version because, as most of us well know, most of the old plugins/scripts do not work with the latest version. This has 'slowed' my full implementation of it to a production environment, but I haven't given up on it.
In my opinion, if you can live without most of the old plugins/scripts, it's definitely worth switching to.
