Go for it...!
Just make sure of a couple of things...
Spin the blade, no power, and make sure you don't feel any bearing issues...
Run the cranks all the way to full position and back...smooth...?
Check the arbor by grabbing the blade and try to rock it side to side...
Do the same with the motor...especially if belt driven
Check belt pulleys to make sure they are smooth and won't fray the belt...
Turn it on and make sure it runs nice and smooth...check to see if the blade/arbor run smooth...no wobble, etc...
While it's running, lift the blade up and down...likewise the bevel crank...
Check the fence to make sure it moves smoothly...check it close to the slot to see if it winds up in the same place when you move it...
Check the table for flat...bring a straightedge with you and check it N/S,E/W and diagonal...
"Bang it around" a bit...anything loose...hardware, nuts, bolts, etc...
If you're getting accessories, check that they are complete and functional...
Make sure you get the manual...if not on paper, can you get it from the internet...get the model number...
Just some thoughts...