Jack, what's the boat like in rough weather? Obviously designed as a day boat, but am really quite suprised by the speeds you say. Presumably that is only on very calm water?
I bought a small sailing yacht (24ft) and it keeps weather nicely, but 6kts is too slow to be fun, so now I'm looking at motor power... After all, do you think I'm the sort of person that will let the wind dictate to ME where and how fast 
Hi Stuart,
In rough weather, she'll still go well. But generally, we don't push the boat hard (Petrol prices sky high!

),
On flat waters, she'll kick out a good speed. If it's a bit choppy, you can expect that to be cut a bit. But, I wouldn't be able to tell you accurately, as I generally don't push the boat (When I'm there, anyway...

) Anything over 15 knots, and it get's a little bit uncomfortable. Which isn't the point of sailing, I think.
You're not the first to be suprised by the speed it goes at

When it was RNLI day, we had some friends on another, "Top of the range" Cruiser. Quite big, too!. They flew past us, as we were just trailing behind the crowd, then once we were out of the channel, we gave it a bit of welly and cheekily waved as we went past

Jack.