My experience with the Har-Bal folks has always been outstanding. I got the 3.0 upgrade in January, used it once, then promptly went on a trip back east for 3 weeks. When I finally got back to my studio, I fired up Har-Bal, and........it didn't work! I sent off an email to Paavo at 5:19PM on 2/13/2012, and I had a return email from him at 6:04PM diagnosing the problem and telling me how to correct it. I did what he said, and he was right, and I was immediately back in business. It's really tough for me to imagine any better tech support than that, unless the guy came over to my studio and personally fixed the probelm for me hisowndamnself.
As for Har-Bal 3.0, I think it is a great tool to add to the toolbox, and I highly recommend it. After you finish your mix and you think you are done, render the mix into stereo and then import it into Har-Bal and take a look at it. You'll immediately be able to see any weak areas of the mix and any areas that are too strident. Let's face it, unless you have a set of golden ears (and I'm betting the majority of home studio folks don't unless they happen to be a pro mixer and/or masterer, in which case they prolly don't need Har-Bal anyway), it never hurts to "get another opinion". Har-Bal also allows you to generate an EQ curve for any number of refernce tracks that are in a similar genre as your song, or represent the goal you want to reach sonically with your song. The prudent thing to do then is to go back into Sonar and adjust the mix of the indiviudal instruments and tracks to try to correct those deficiencies (now that you know where the problem areas are). After that, if you still need some tweaks, then you can use the tools within Har-Bal to correct the EQ problems and move on to the mastering stage. (Har-Bal has a feature where you can segment the song into Intro/Verses/Choruses/Middle8/Outro segments in case each segment differs significantly in sound, and you can then generate a separate EQ analysis curve for each of those segments. Plus, you can look at each of those segments from a Mid, Side, Left or Right standpoint with separate EQ curves. Putting offline DSP to good use!)
When I was back east, I got some stereo reel/reel tapes from the guys I used to record with back in the late 70s. These tapes were all over the place: pro studio, home studio and live gigs.....and they varied sonically from pretty good to pretty bad. They were recorded in 1980 and 1981 after I moved away. They wanted me to digitize them, clean them up and make them sound good, then master them. There is certainly no way to go back and adjust any mix tracks now- those tapes are over 30 years old! Har-Bal is really helping to get a handle on the sound in this effort without overly coloring the sound.
My $0.02
JV