well, any little laminate trimmer with a bearing trim bit will do for some ordinary melamine shelves, but the MFK700 is an exceptional tool that can nearly eliminate "oopsies" in trimming work where the stakes are higher. There's also an accessory for the little festool of1010 router that allows it to mimic the function of the MFK with a right angle plate that rides on the surface of the work helping the operator to keep the router under control.
Virutex makes the FR292- Tiltable trimmer, which is similar to the MFK in some ways.
For everyday laminate trimming type operations with a bearing bit I use a Porter Cable 7310 but I do not especially recommend it. Bit changes are knuckle-busters, height adjustment is awkward and some users have complained of the bases being out of square to the collet. The older Porter Cable 310 production trimmers are said to be quite good, but only available second hand.