IVe been playing SH3 with GWX for just under a week now , I have to say I am really enjoying it.
Im completely new to the whole sub sim scene.
One thing I would say tho - its a real time-sink , the last couple of nights for me have gone in a flash
(been late for work a few times too!)
At the mo im am playing at 34% realism , the default , I will in time change it so that its a bit harder (manual targeting, contacts etc).
I left my crew surfaced last night, in very stormy seas of the outer hebrides with the gramaphone playing - I will be ordering them back to work tonight tho..