I cannnot help you with the price but any questions about operating and perfomance are easy.
Any price paid for a used flailmower in good condition is really a good price though and I would not want to see it slip away from you.

:thumbsup:
If you are doing housekeeping in blackberry rows it will be fine just as it would be in removing them.
The slower you travel in forward and reverse for the initial pass for heavy brush the better as the finer it will shred the brush with zero issues.
Its better to reverse over heavy brush stands and avoid having a stick in a cooling fan or radiator as the creeper gear in reverse will assure the stubble is very very short.
Just be sure to have the replacement knives on hand and grease the rotor bearings regularly with no more than 6 or 7 pumps of grease "per day of use" as the bearings have seals in them to maintain the clean grease in them.
IF you have a lot of berry canes stuck on the rotor or rubbing against the bearing housings unhook the mower and put ity on its back to remove them as the canes will act as a heat generator and the grease will not be as effective in lubrication.
The slicer knives are cheap and they must be replaced if broken or the rotor will be out of balance.
A WEN wet well knife grinder is the best way to sharpen slicer knives too.
:thumbsup:

:drool: