Are T-slot tables necessary and is it worth paying more for steel?

T-Slot Aluminum Table 600 t slot table 75 x x Aluminum t-slot table This aluminum T-slot table works great for drill presses and general workholding applications transformers battle for cybertron slot Value Collection 2 T-Slot, Box Table Swivels TABLE RF-35

top slot games online Basically, what I want to buy is a T-slot table such as you find on a milling machine It has to be something like 20 mm thick cast PLATE with T-slots in it,