we have looked at them extensively, and plan to buy in the spring. They are built to a price point, and for us that is a good thing. The new 105Mc has little teak, uses synthetics, is well laid out for a couple (full size berth), and has all the conveniences of home. Plus they sail well. Owners either love them or hate them, not much in between. There is an active group on yahoo, and the family owned firm is very supportive of their products.
The boat seems to be of negotiable quality, depending on who asks and who answers. We found them to be of decent at least as well built or better than "production boat" standards. The UK made outdrive may cause some sneers, but everyone agrees that with proper maintenance, it will be quite serviceable. As with every thing human made there are some compromises. Get a survey by someone who has experience with Cats, and preferably with Gemini's...they are a tad different.
All the best on what you decide. Wish we had the house sold for the next step.