Need Comment for buying copier Bizhub 350

[Matoku]

Dear all copier technician,

I planning to buy a few unit of reconditioned Photocopier from my friend.
The Brand is konica Minolta Bizhub 350/600 and 700.
What is outcome of these copier according your experience?

What is the common problem of this model?

Thanks for your opinion

Matoku