No first hand exp. w/Tartan 33. I am familiar with the T27 & T30 which were from that era and I can say that they were well made boats.
I do note that there seem to be 3 "flavors" of the T33 listed here:
TARTAN 33 sailboat specifications and details on sailboatdata.com
Std. fractional rig, Masthead rig & small masted rig.
Masthead rig = more sail area.
Also of note is that this is a "sheel" keel boat. The sheel keel was S&S's idea for a shoal draft boat. Shoal draft boats tend to not point as high upwind as a standard fin keel design.