As with any used tuba, it's best to figure on spending several hundred dollars to get it properly serviced. Keep that in mind when you bid. There are several dents in that horn that look critical, especially the big one in the leadpipe. Also, some of them were tuned a bit flat, but that's an easy repair- see the second link in my original post. Bloke or TubaTinker could be more specific.
But these horns are known to be good players, and some can be very good. If you have a good relationship with a good shop, that may tilt the balance in its favor.
For the record, my Sonora is basically the same tuba, though newer. So I'm just a bit biased
