I've been going on about how good the R1 version is to my mate for a while cause he hasn't got his player converted but I was wondering today - does the R4 disc play on un-modified players like so many other R4 discs? Also, is the OZ version identical to the R1 version and the forthcomming R2 version in terms of extras? Anyone got the R4 version? Any help? Cheers.