Hi Mitchell and welcome.
I cant help you with the model but it looks very similar to a single group version of my machine which is a P/Tre 2 group semi auto.
A few things at a glance.
External or internal pump? Im 90% sure this machine will need an exrternal pump/motor. If so, make sure it comes with it or youll be up for another $300-$350.
The electroinc touchpads are notoriously tempremental and can be expensive to replace.
The steam function on these machines is so-so at best. If you wanna work on your "latte art"- this is not the machine! Youll produce a decent-ish micro-foam, but nothing as good as alot of high-end doestic machines will produce.
I would think it would need a pro-service, depending on its history this may be a simple seal replace etc etc - or it may not be and MIGHT end up costing $$$...BUYER BEWARE!!
Thats the bad I can think of at a glance.
It doesnt neccesarily have to be plumbed in, with some ingenuity, you can get around it. Contact me if you buy it and Ill explain how I did mine.
These things are built like a tank, solid, sturdy and will pull very good espresso all day every day for a long while yet - if treated nicely.
Heat Exchange means pouring a shot and steaming milk simultaneously- good for the quality of your coffee and convenient.
...and having a commercial machine on your kitchen bench is just the sort of overkill that appeals to me!
My advice is this. BE CAREFUL. But if you happen to have found a good and complete machine for that money, you may have done very well, but the "pros" of having a commercial machine are potentially accompanied by "cons", so go in with your eyes wide open.
Cheers and good luck.