@ BobF - There is cross grade pricing from other DAWs. It's $299.00
Although I have S1 - 2 Professional, I've since skipped any updates and went with Cubase 7 - now up to 8 in the summer of 2013 - mainly because after countless repeated requests for Presonus to answer the call of many of us to do something more within the confines of their MIDI department, [or rather lack thereof], they continually ignored us - through each and every update and version - and it looks like they've done it yet again.
I see absolutely nothing new in the MIDI department, whereas Cubase is a MIDI monster.
Seems a little odd to ignore the MIDI requests and yet boast about Kontakt support.
An upgrade price for me chimes in at $185.52 CAD. I'm gonna have to have a door to door salesmen who'll not only vacuum my floors, but also leave a Bible or 2 on the table in order to sell me on this to lay out almost $200 more bills.