I own three of Jim's tables (two stand-up, one sit-down) and can also attest to the high degree of craftsmanship involved in all of Jim's products.
The sit-down table is ideally suited for a fixed performance space and can travel (but takes a bit of time to break down and setup). It works very well for true formal close-up work or as a table for parlour presentations. The Stand-up tables are ideal for "station work" at trade shows, conferences or other venues where spectators "walk up" to you. The lowest height of the stand-up version is considerably higher than the sit-down one, however, and it is not recommended if you think you might want you (or your spectators) to sit and watch your performance.
Both types have the same size tabletops, but the sit-down version has a drawer (which I never use) and the stand-up version has legs that fold together enabling quick load in and out.
Jim is also very good about modifying tables for customer's specific needs. He added a formica surface to my sit-down table for dice-stacking, and custom-built a set of the X-table legs to allow for a 32" height that allows me to use the stand-up version as a portable sit-down table.
I travel quite a bit with my formal close-up show (spectators sit L & R for the duration of the performance) and wanted the ease of set-up of the stand-up version, with the appropriate height for spectator seating (with the stand-up version, I, and my audiences felt like little kids sitting at a miniature version of the grownups table).
As for table surface, Jim used to cover them with Gibson pads (no longer, unfortunately), but now surfaces them with a fabric similar to the Apollo, Zeus, Hercules, or [name your deity here] pads, which some people find catch on the smallest patch of dried skin and for that reason don't like much...
To a working performer, these tables are cheap for the elegance they impart to your performance. As a piece of your equipment, it shows to your audience that you care about even the smallest details of their experience while adding to your overall perceived value.
For the enthusiast, they make a great surface to practice (and occasionally perform) on and a showpiece/center of focus for your magic den. Once again, it can show to others who are aware of your "hobby" the level of commitment you have made to the study of this ancient craft. It is, however, a pricy piece of furniture, particularly if you can't write it off...
I am an ardent fan of Jim's work, and if you can afford them, and will use them, the Zachary tables are definitely heirloom quality furniture for the discriminating student of magic (pro-, semi-, or enthusiast).
Am I gushing?
Jim Zee's Magical Enterprise