Omegaonne

I was just on the kleeman site and noticed an E500 converted to an E50K. The horsepower gain with going with a kleemna kompresser is amazing! I was wondering if anyone here has pulled the trigger and upraded their E500 with the kleeman kompressor. Was it worth it? And if so, would you trade it in for an E55 being that the price to upgrade and performance is pretty much the same? Thanks