I have the little sibling, an 850, with four section 60' boom.   It was a vast upgrade from what my Dad used.   I like the complete clean out sump, only about half gallon left in the tank.  good agitation, and easy to load.   two small changes I would like is an easy way to drain/clean the sprayer tank, and same for the clean water tank.   Possible, but have to prime the pump then drain.  Just a minor inconvenience.
I like the short wheelbase also.