Personally I have always found Spotlight searches to be time-consuming and poor. Leap has literally changed the way I file and find things. Have dumped all my registered note-collecting apps (DevonThink, EagleFiler, Yojimbo, and the list goes on) and am running with Leap + tags + Finder. Absolutely wonderful application, well worth the money.
The lads are still polishing off the sharp edges and communicate really well.