Played one of these in a local music shop last week for 20 minutes or so, just to get used to the ins and outs of it really.
My initial impressions were that it was a very comfortable instrument to play. I preferred to anchor my thumb over the end of the neck to get a boomy sound, which perfectly complimented the flatwound strings. It was a used bass, and the previous owner had had the stock pickup replaced with a Bareknuckle version, which meant that the output was slightly higher than normal, but tone-wise, it was pure classic Precision.
As has been said above, I don't think I'd buy one to use exclusively, but it would certainly be a good addition to any player's arsenal, if only for looks alone!
Danny