Yes the Omega 804 is excellent (probably the best) for leafy greens, wheatgrass, etc. It's also built like a tank and has fantastic customer service. I had mine for 6 years of heavy juicing when the forward motor stopped working.
Called customer service and they said all I had to do was pull the switch out and reverse it - and it should take only 2 minutes with no tools. HOWEVER, if I preferred they would just send me a new unit. I was stunned - normally I would have taken the brand new unit after 6 years for zero cost, but they were so cool about it I tried reversing the switch anyway. It DID take 2 minutes and was dead simple with no tools - and works like it always has.