Alot of the earlier machines were changed over to the aggressive shake system when they were in for upgrades several years ago. Your dealer can run the serial number on the computer and check what all has been done.
2003-2005 machines that were corn or rice versions had the shaker update installed. Any 8010's that were built as a small grain versions from the factory did not get the shaker update. If the machine you are looking at does not have the update and you want it I would recommend you buy a machine that has the update. It involves alot of work and parts to update a machine.
An easy way to tell if you have the "enhanced" cleaning system is to look at the shaker arm at the very front of the machine holding the grain pan, if the bushing clamp is horizontal it is enhanced, bolted vertical is the old style. The enhanced system has more of a lift in the stroke than previous.