Becky and I came scarily close to buying the Res Nova a few years ago. It had been on the market for about 18 months and was available at a very good price, but we were spared having to make the big decision when someone (thankfully!) beat us to it. On reflection I don't think that running a B&B, however glorified, would really have suited us.
We've stayed on board since, and Jools is dead right about it being the most convenient place for ribsters. Although the restaurant is quite posh (or was a couple of years ago), the accomodation is quite basic but there is no problem wandering in wearing salty dry suits which can be a problem elsewhere.
When we stayed there the B&B price was good, but the restaurant was seriously expensive and not such good value. However, once you've tied up alongside and had a couple of beers it is very tempting!
The aft deck is also a very good place to sit in the sun and just watch the world go by.