I'm with the majority of the reviews above, this is a great looking game (I'd say the needle swings over to game and away from simulation) which is engaging and great fun to play.
There are a few niggles that I'll report to the Dev's once I know the mechanism for doing so but nothing that make it unplayable.
Pros & Cons? I for one like the hands-on approach to driving the boat but would like to hear confirmation/information from the sonar station etc. rather than have to catch text pop up for a few seconds out of the corner of my eye.
One debug hint - I was having problems controlling the scope until I realised interference was coming from my joystick which was jammed over to one side (MS Force Feedback Pro with no power plugged in). After I centred that that everything was peachy.