I've been wondering the same, whether it's worth getting PO+ as opposed to the copy of PO I have. Now that I have a good rhythm going, for going out on missions, kidnapping guys, and coming back, getting reports, etc., I'm really enjoying this new spin on Metal Gear Solid. It's definitely an interesting missing puzzle piece in the whole Big Boss/Solid Snake story. What's infinity mission like? Does it share any additional plot elements, or is it just another area to explore with new bad guys to knock out? And is the original single player story in PO+? If so, I might upgrade...however, money's tight...so prolly not, ;-)