I had it on for an evening, turned it off for a couple of weeks. Hard drive corrupts, reinstall Vista, left it on. Speach recognition can't get past it. Left it on, got sick of incompatibilites, reinstalled XP. Lived happily since.
As a school librarian, I have experience of the Eclipse software... It is in desperate need of optimisation, and there are a lot of bugs. That said though, it does get the job done, if not in a timely fashion.