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I'm a fan of these old Connoisseirs - and the newer ones (some of which I think are at Herbert Woods.)
I've had Opal Gem several times. If you're concerned that it is too small, take a look at the Fairways and Preludes - they are the same design as Opal Gem but with another cabin. Check the bed layout in the aft cabins - some have doubles and some have crossover bunks.
The boats are very easy to handle, and the internal layout is great - the whole of the "saloon" is open when the roof is back, and the galley is very usable.
The engine is in the back, and much better silenced than before, so it's pretty quiet.
I think that the only design flaw is access to and from the boat. Access is from the side... with fairly steep steps into the saloon... and the side of access changes when the roof is down. If you are moored stern-on with the roof up, it's not too bad to walk along the port side of the boat holding the rails and then take the steps down, but if the roof is down then you need to go down the starboard side, and there's nothing to hold on to.