I've heard what definiton what already mentioned, that you have to pick out a Dukoff in order to get a good one, for every single one is different and if you get a $hitty one, you'll be sorry.
I also agree with Jim. I'm gonna get a metal Otto for my alto over the summer, $20 cheaper than a possible POS Dukoff. The older ones are better, my band director has two and man they are sweet. A lot of pro's play on Dukoff (Sanborn, Ken Gorelick [yes, he counts], maybe Michael Brecker), so if you're gonna get one, get an older. Otherwise go with an Otto and don't look back!!!