I have a 0.13u design kit and it has a Mosfet that is low Vt = 0.08v so I want to know what are the drawbacks of using such a transistor if there's any? Thanks
Only drawback is: you can't completely shut off such a MOSFET. Even with Vgt=0 it will "leak" a drain-source-current in the order of uA's (@ room temperature).