The Rose finch is a pretty decent mech and since it has a 510 pin it is a really good place for a new mech user to start and the sourcemore price is very good.
It will work with an mtl no issue but remember with a mech there is no way to adjust your wattage except by the resistance of your coil/s
It is absolutely important that you calculate you resistance and make sure you battery will handle the amp draw.