I’ve got a 2006 alloy Rush 4000. Builds up nice and light, climbs well, very stable descender and great for long rides and endurance events. Very capable bike – have a Prophet as well and ended up putting 160mm forks on it to open up a worthwhile gap between the two.
The only downsides are arguably the low BB, which takes a little getting used to but isn’t as much of an issue as a lot of the magazines make out, and the back end is a little bit flexy (relative to the Lefty up front, anyway). It’s also not the most exciting, involving bike in tight and twisty singletrack but still pretty competent.
I’m very, very happy with mine.