I have one. I've had to work out some bugs and I still struggle with tension, etc.. but it's ok. If I had it to do again I'd consider a cheaper straight stitch machine with FMQ capabilities--like the 1600P-QC. I'd CONSIDER the machine again if someone offered me a deal like the one you've been offered ( but not for $1600 that I paid for mine new).
BTW, you can get a new 1600P-QC for about $800. Just a thought....