Well, the mechs may or may not provide you the same satisfaction, depending on the power you like to vape at. With a fresh battery you are putting 4.2V to your build (actually less due to voltage drop). Then the voltage will begin dropping as you vape. You may find you want to change
batteries fairly often with a 0.3 ohm build.
Also bear in mind that those mechs are single battery. I think your SMY uses 3 batteries so has much longer life between battery changes.