I used one of these 10 years ago and can confirm they are rapid. You should see 50 knots on a good day and 40 knot cruise not a problem.
The back end isn't very planted in High speed turns and tends to skip which can either be fun or worrying depending on you state of mind! Either way it's controllable. You also need to be aware of this when you fly the boat as it really does need a straight helm on landing to avoid a hook.
The hull was made by Porter Brothers (very well im my opinion) for Tohatsu also branded as Porters and i believe they moulded them for Solent.
Your'e gonna have a lot of Fun in that boat Tim