The main problem with Cadets will be the heads drying out particularly if it is a low use machine.
As already advised see it printing and check the quality of a full colour photo type image. If possible print some solid blocks of CMYK to see if there is any banding. You might also check print/cut alignment and quality,
Remove the cover on the right and look to see if there is any ink leakage around the pump. The general state of cleanliness will indicate how well it has been maintained. Check the ink drain on the left of the head station and see if it is clogged. Build-up of Activasol ink here can eventually contact the head and drag on to the print leaving smudges or drips. Although messy this is easy to clean.
I would be happy if it were using EcoSol Max inks rather than Activasol, as this will eliminate the head drying problem. If it is, check the RIP you will be getting. Troop/Wasatch is the original supplied RIP for Activasol, VersaWorks for EcoSol Max. You will have problems getting profiles for a Troop/EcoSol Max combination.
I hope this is of use. Good Luck.
Peter