This has a fault and sometimes boots up with the video sync out (as per the picture). This may be a serious fault and only useful for spares and repairs, or may be just a case of reseating the internal cards.
Once booted correctly this switcher works fine.
I also have a couple of Panasonic WJ-MX50's with I will list in due course unless you want to make an offer.
When I last tested this it booted correctly approximately 3 times out of 4. I personally felt that I could no longer rely on this, but never had an issue with it when it was running correctly.
The switcher has not been used in the last 18 months.
I have not tried doing any major diagnosis on this as it was a good reason to upgrade to HD.