Buying A Second Hand Head Unit

[PhloP]

Well im getting my first car soon and i need to get the sound system sorted.

On a tight leash when it comes to how much i can spend but im really trying not to go with a cheap brand like fusion, although it would be a damn sight easier.

My question is there any reasons not to get a head unit second hand?

I woudnt get a sub or speakers second hand because you don't know what they've been put through but is there a reason like that not to get a second hand head unit?

Thanks, PhloP