Who uses a Peterson Slabber?

[Troy]

Mine is on the way with my ATS mill and I'm looking for tips, pointers, observations or recomendations from current users.  Which chain do you use?  How often do you have to resharpen when cutting a particular type of wood and size?  How many chains do you keep on hand?  What type of spare parts should I have on hand? How do you charge when milling slab wood for clients?....