I have a marshall mg50dfx which i love, and my friend has the mg30dfx. They are somewhat the same, but one clearly louder than the other. They have 4 digital effects...delay, chorus, flanger, and delay/chorus. Also, it has reverb aswell, with an FX level knob. The difference between the mg30 and 50, i believe, is that the 50 has a gain knob for the clean channel and a footswitch, which the 30 does not. I have played both, and in terms of sound, they are both very good amps.