A grease pack 18K spindle just sounds like a terrible idea. My buddy's shop has a Mill P500 with the pallet pool option and I believe a 20K spindle. He really likes it, although one downside of the pallet pool on the backside is the weight capacity per pallet is lower than a similar sized machine from say Mazak. The arm has a long way to reach thru the machine. They run mostly aerospace superalloys in it, lots of titanium right now. He's also said the applications support from GF has been excellent and he loves the Heidenhain control.