msmcleod
If you got V2 with Sonar Platinum, you should be able to get a free upgrade to V4 Elements.
This is worth doing, as the detection is way better. I noticed a big difference when dragging audio on to MIDI tracks with V4.
However the move to Editor is worth considering as this gives you polyphonic detection/correction.
IMHO the detection of simple instrument data like piano/rhyt./arp.guitar/bass is quite well (in V2 and V4), but the detection of vocals, solo guitar and of polyphonic data like synth, choir, ... is very bad, especially related to note separations. I use Melodyne very often and I always have to do a lot of time consuming adaptations in the detection mode, before I can do any real changes!
But nevertheless I like Melodyne, because there are a lot of possibilities how to use it. The stability of its code is another question! But since I do a lot of saves in between and avoid to do some critical changes during playback (e.g. changing the loop position, switching to detection, ...) I have less crashes!
Marc