When I first discovered this, it was great then builds for last fall through the end of the year were very troublesome. Lots of crashing, memory leaks, and sluggishness, but this most recent version seems to be back in the game. For Mac-to-Mac sharing, Apple's Screen Sharing can't be beat for speed and ease of use (though I need to do the usual hacks to it to get the bonjour browser and other features) but this is again my favorite third party VNC viewer. I especially appreciate the new authentication choices. If you gave up on this, give it another try.