I was going to buy a Mason 33s a few months ago but had a change of heart. The change was towards getting a larger boat and didn't have anything to do with the Mason itself. Originally I was looking for a boat under '35 OAL (real OAL length, not what's listed) so it would fit in my slip. I decided not to constrain myself to the slip size and dropped the Mason idea.
They are beautiful, very well made boats and once you've been on a Mason 33 and a PSC34 (shopped and looked at theses extensively) you will want the Mason.
I've had discussions with the two Masons listed in the states and traveled out to Texas to see the one listed there. I have some photos of the TX boat and would be glad to talk to you about either of the two boats. I also looked at one in CA that got an offer the day I saw her, she sold. That's assuming you didn't find another listing (they only made 24 of these boats.)
I've also talked with Windsaloft from this forum, and he was a great help.
PM me if you'd like to talk, I'm happy to share my opinion and what I learned.