Considering New Holland 550 baler Purchase

I continue to patiently look for another round baler for the 2021 season. I’ve found a NH 550 unit with less than 500 bales rolled. It’s a 2015 model. I assume it’s a big brother to a 450 model. The price is less than $19,000.00
I’m sure there are several people with these balers that can provide input. Is this generally considered a Reliable baler or are there issues to be concerned with? 

My other line of thinking is to purchase another NH 678 and refurbish as needed to have it reliable unit. I have another 678 that I’m familiar with so hence my focus on this model. And a 5’ wide baler is a must.

Considering New Holland 550 baler Purchase