Just look at the great work modders have done to SH4 already. I've no doubt it will be a great title evetually. I haven't bought it yet and I don't think I will for atleast six months or so.
Till then GWX offers fantastic gameplay. All the screenshots we see of SH4 where subs surface a few thousand metres from enemy capital ships just don't occur (with any chance of survival that is!).
Nope, although I like the idea of a modern pacific based sumsim (and I really love how it is the most popular PC game ATM), I will remain in the Atlantic for awhile.
You will not be disapointed with GWX, enjoy!
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BBW Cam