At present, I am playing both SH3/GWX 2.0/Uboat1.2 and SH4 with several of the available mods. I have used both the Trigger Maru and Real Fleet Boat "super mods"
over the past several months.
I must say that GWX goes a very long way to making SH3 more interesting to me.
SH3 seems to have reached a level where to improve it any further would require modifications that would result in a brand new sim, with everything that that entails, e.g. new engine.
SH4 is reaching the point, after four official patches, it should have been when it was released. There are, in addition, several glaring omissions from the game that are being addressed by the mod community. Lurker has completely redone the dynamic campaign according to historical references. Ducimus has added the class of US subs that were left from the game. Once these items are completely addressed, the rest is just refinement. The pace of mods is quite rapid. There are so many very good mods, it is hard to complete a patrol before the next "must have mod" is released. I just hope that we can convince Ducimus or another to remodel the
Narwhal class to their full glory.