[Sailor Steve]

I've been playing U-boats with SH4 and Operation Monsun for some time now. Immersion-wise, SH3 with GWX gives more feel to the harbors and such, and adds more, and has had a lot more development time. That said, SH4 is much more stable, gives really cool latitude and longitude coordinates on the map, and the U-boat add-on gives KM grid squares right down to the fourth digit! I'm having a great time alternating between playing both.

Yes, there is still a long way to go (and it may never get there for u-boats, with SH5 on the horizon), but SH4 is definitely worth the money for the way the crew management works, and for the way it looks inside when you order Battle Stations. Loads of fun.