It's a decent model.
The large control surfaces make for a good handling boat, and it's a simple no nonsense design which you can modify as your experience dictates.
Worthwhile modifications include adding a servo to the front hydrovanes, adding a ballast system and fitting a gland/stuffing box to the propshaft.
A better alternative to this kit has just been released, the Thunder Tiger Neptune submersible/ROV. A very complete model, which can be put together with little more than a set of screwdrivers. It is a proper static diver with glanded shafts, and the whole thing is as tough as old boots.
On the negative side, the model looks a bit toy-like, however if you're a decent modelmaker, you should easily be able to modify the boat to resemble something more scale-like.
Price for the kit is £299, quite a bit more than the seawolf, but you are getting a better product for your money. Also, it comes with everything you need bar a transmitter, receiver and battery charger.
Andy