First of all its a brake, not a shear. Yes there are some disadvantages to the mag break....but for 90% of our customers who have them, the benefits far outweigh the disadvantages.
The mage break is just one big math problem. The machine generates 6 tons of downward force...so....if what your bending requires more than 6 tons to clamp it down, you will need a traditional break.
You can do full enclosures, radius bending with an unlimited box depth..... if your into sheet metal, those alone should be sexy features.
Shane