I used to use a C&C 35 as an instructional boat.
You mentioned the "smile" and the window leaks.
- the primary winches seem to be at the wrong angle, they could benefit by being titled slightly outward. The sheet seems to bind at the base of the winch.
- the holding tank developed a leak at the top which only became apparent when on a starboard tack which allow a gap to open.
- the cabin top clutches could be a pain as they were hard to open.
It is not as tender as the C&C 29 of that era.
Aside from those great boat. Sailed well in light air. This one had hank-on sails
The strongest winds I had it out in were 35 knots, 3 foot waves. It handled quite well with 2 reefs and reefed down jib, moving at 7 knots.
It has been a while since I sailed it. Other things might come mind. It as my boat of choice n that fleet.
The accommodations will be great for 2.