Its about the 4th time they've been listed on eBay.
There was a thread started back when they were first listed because, IIRC, they were asking, like...$7,500?
Definitely some Ampex 440 influence in the cosmetics on these...different animal though.
This listing is fun to look at. When was the last time you ever saw a complete multitrack mastering setup from Teac's first Tascam offering? These look to be in great condition too.
AFAIC the price is now about right, but I'd see this is a nostalgia setup rather than a production setup. Community support and parts are going to be very scant. Plus I believe the mixer is not a real great unit. I've had dialog with somebody that used one back in the day and got some decent results when using a custom power supply. But as a collection for a Tascam enthusiast who has the space and funds? VERY cool. Would be fun to play with wouldn't it??