The heavier guage tables get very expensive and they still suffer from the same problem: Flimsyness/wussyness.
Virtually every table-regardless of guage- are made the same way; A "Tray" is made of s/s, two galvanized "u" channels are spot welded to the underside, and leg sockets are spot welded onto these channels.
IMHO any table 36" long or under this are fairly stable. Anything longer than this, and the table behaves like kids in a bouncy castle. I've had K.A. mixers and robot-coupes shimmy and dance themselves off the table, and I've damaged s\s table edges by breaking 5 kg slabs of chocolate over them. Thumping large amounts of dough on these tables is like dancing on a bed
So, I tend to look at these tables as "kits", and I've converted many tables 48" and longer into stable, steady workcenters.
Before you even assemble the table, you cut yourself some 3/4" plywood (NOT mdf a.k.a "termite barf") to exactly fit in between the two channels on the underside of the table. Get a pocket-hole jig and pop some holes along the long edges. Now contact-cement the wood in place. Then pop in some sheet-metal screws in the holes and screw into the channels. Wedge scrap wood inbetween the plywood and the inside "lip" of the edges.
Usually the undertable is flimsy galvanized steel. The undertable is necessary for the integrity of the table. The same treatment should be used for the undertable, as these bend easily and sag. I've seen brand new ones sag with the addition of two sacks of flour, but then again, the more weight you have on the undertable, the steadier the table will be.
The galvanizing on the undertable is very thin and scratches off easily from cans, porcelain ware, and the usual stuff. It rusts quickly and gets dingy and cruddy looking quickly too. Regular cleaning with scotchbrite pads will wear off the treatment as well, and then the rusts sets in . (the dreaded Neil Young syndrome...) I've had good luck by shooting a rattle-can or two of tremclad paint on this shelf, and scratches are easily touched up.
If you're not handy with tools, or don't have access to someone who does, it may make sense to go for the heavy guage tables, but these are very,very expensive. On the other hand, working with a flimsy, wiggly table is a frustrating experience.
Hope this helps