Quote - So we have:

Smith Micro: version 2.2 @ USD109.- (http://mysmithmicro.com/marcom/eblasts/Silo/20131106/A/index-web.html)

Steam: Version 2 @ EURO 54.99 http://store.steampowered.com/app/100400/

That is a factor 2 in price. Is there a significant difference in features or performance?

Good question. Maybe it is possible to upgrade? Sitting on the fence, I have a budget to keep, and this could really bust it.