I'll upgrade and feel pretty certain I'll be let down but...

I really dislike Lightroom 4. I haven't tried 5 since I know if I don't purchase it after the beta is over it will be a nightmare going backward. I'm going to go with Aperture 4 when it arrives regardless. The few things LR is supposed to excel at don't really mean that much to me. The only reason I went with LR was due to aperture's inability to handle purple gradient.