I assume you are looking at a 41.1. We have owned a 31.1 keel and now a 35.5 keel/centerboard. Bristol built (most of the time) a high quality boat. They sail very well. The centerboard is not ballasted and the boats built with the centerboard option are a little tender. We reef sooner on the 35.5 than we did on the 31.1 and we do bury the rail on the 35.5 and did not on the 31.1. For us, the trade off was needed since our homeport has skinny water. We may move up again and we would skip past the 38.8 and go for the 41.1
Bristols have a fair amount of wood. We love it below and pay to maintain it above. We are still hooked on
varnish.
If you like the Bristols, you may also want to check out the Wasquiez - specifically the 38 footer.
As always, get a tough surveyor. These are older boats and you want one that has been consistently maintained and upgraded, not just cleaned up and awlgripped for sale.