Her is an excerpt from another post by bbtuna(i don’t agree with all his opinions but he describes tables well) :
"Brown Marble - Brown Marble 1983 - 1997 - stopped using the metal feet about 1988 but continued to sell them as parts until 1996 $350-$450
oldest versions have the large metal feet and are considered the most (some debate now with the newest complete change T3000) solid consistent of all the tables
Most common have the current smaller plastic foot - I am not aware of any other substantial difference between this and the large foot except the feet...this was my favorite table but the new T3000 is very close in playability but considering the age and time "in the field" the Brwn Mrbl is still the best table Tornado has made but if the T3000 stands the test of time, it will be a toss up on which is best and the decision will be which play style you prefer
so, if you are looking for an inexpensive used table, this is your best bet...wide swing in quality because of how long they have been out there so this requires patients and careful shopping"
As for the pricing if the table is as good as the pics look I would not lose any sleep over paying $500