It seems that ajust about all current or previous Dufour owners have or have had very positive experiences with thir boats. I have met those caught in severe storms off-shore and in the Lakes in even 25' Dufours that still rave about those boats and "those days". Dufour still builds them so i guess there is some sort of mechanism for parts and getting questions resolved. O'Day doen not.
I like the looks of the O'Day 40 quite a bit. the interiors are rather nicely put together as well. I was considering one a while back . Blisters pretty much terminated those discussions.