Grif is right about the drm. The drm is intrusive, to say the least. You get constant pressure by an online license check system which could make you lose speech should your internet go down. You are limited to 3 activations, and unless you deactivate one before switching computers, there goes one of them down the drain. Most importantly, keep in mind that while I don't have exact stats, the money you're spending to buy Eloquence, if you make this move, isn't just going to Code Factory, or any other distributer, but rather right inside the depths of the big, fat, monopolizing corporation called Nuance. Those are some things to think about. My advice would be to use sapi4 eloquence, and bridge it into your sapi5 using the Baum International Tts, which does not require Baum Vergo or Cobra to be installed. This is a bridge that lets you use any voice, whether that be sapi5 or 4, in your sapi enabled applications. So basically, yes you can go as far back as running infovox230/330 on sapi5, and yes you can run Eloquence this way. Plus, from what I hear, this version of Eloquence, the sapi4 one, is better quality. People have said the Code Factory one clips a bit, and for a while it was thought to be a trial limitation but it definitely wasn't.