I was given a broken Sony SL-HF600 along with over 100 tapes that were recorded from that VCR. I managed to fix the VCR (bad voltage regulator IC STK5441 in the power supply, along with a gear in the cassette loading mechanism that I broke), and aside from the regular (non hi-fi) audio being very muffled, it works perfectly.
The recording quality is very good -- especially in Beta II mode. Most of the tapes are simply movie copies in Beta III mode, so the quality isn't super-great, but considering that most of the tapes are 20+ years old (and were stored in an attic for quite some time), the quality isn't as bad/deteriorated as I would expect from VHS.
Here's the machine:
