I owned a S23 for six years .
Used it mostly for inland waterways but when we did go fast on the Humber it went very well and felt very stable on the plane.
It did tip one time but that was my fault as I didn't check the trim tabs before powering up - they were set one up and one down.
So sensitive to trim tabs yes but tippy no.
Having said that I would say it's a two person boat.
The S23 still looks good /modern despite being now a 15 year old design.
We moved up to a F33 for extra entertaining space , a comfortable bedroom and storage, heating and an oven - we spend most weekend aboard and take all of our holidays on the boat.