Peter's question refers back to a time 7 or more years ago when both Scott Hargis and David Hobby (of Strobist.BlogSpot.com) promoted them. Here is a post from 2011 where I explained the benefits of SB-80dx flashes.
My guess is that yes, there are still plenty of real estate shooters using SB-80dxs because of their great built-in optical slave benefits. I've noticed that the sale price at keh.com has dropped to around $120 which is significantly less than they used to be.
How about it? Anyone still using SB-80dxs?