I think the poly stuff tracks pretty darn great, and as good or better than anything available on the market. I checked out your F major 7 mp3 example and it sounded fine. You could detect the slightest bit of warble in the background, but certainly not noticeable to untrained ears, and certainly not going to come through in a mix. If you're doing serious recording you'll voice the chord somewhere else or have a retuned guitar, to be frank. I think your claim that the poly pitch is "downright unusable" is spurious at best, I haven't seen one mention of settings or stable vs fast tracking. It does what it's meant to. And probably unpopular opinion, but if you have sloppy right or left hand technique, you're not going to have a good time with the poly stuff, plain and simple.