The advantage the IIC will have over the JP2C is that the JP2C has preset parameters. The gain knob on the JP2C presets Volume 1 to 7, or if you pull the knob, 8. You have the full range of the volume 1 knob on the IIC but it was stripped from later Mark amps for simplicity. The JP2C only has 2 pull knobs, gain and presence, while the IIC will allow you to pull all the knobs on the front panel for massive variations in tones you can get. The JP2C has certain parameters some will like more and is MUCH more flexible in a live situation, but the IIC will give many more tones and options in a recording situation for sure.