Eventide makes some beautiful and innovative stuff. People often think of the Harmonizer as an effects box, but it really has some incredible reverbs as well. For the special effects (i.e. harmonizing, certain delay algorithms etc...) a lot of people prefer the sound of the old H3000 even over the newer units. Some people attribute this to the AD and DA stage in the older units. Personally, it probably has to do with that and a host of other older "less efficient" parts in the older box and whether or not Eventide has "upgraded" the algorithms in the newer units. I currently have an Eclipse in my FOH rack and that thing is absolutley CLEAN. Just the other day I was showing someone for fun how clean it was by running CD playback through it with a 1.8 second reverb at 100% wet signal. With no dry signal at all there was still an amazing amount of detail in the verb, and it didn't completely smear a complete mix when routed through it. It really sounded and felt more like you were listening to a live band from the back of a room and not a reverb unit. I have heard that the V2 software in the Eclipse sounds better (an upgrade should right? ), and my Eclipse does have the new software.
H3000's run about $1000 or less used (there are several models available), and Eclipses run about $2000 new. With a used H3000 especially, I would say that you are easily getting your moneys worth