Dust Sucker was a poor quality, unofficial, badly packaged version of Beefheart's lost 'Bat Chain Puller' album. Son of Dust Sucker is the same thing, with different bonus tracks. These bonus tracks are awful quality. Beefheart is a genius, and Bat Chain Puller is a work of art. So do yourself a favour, avoid this, and get the 'Bat Chain Puller' album released early 2012 on the Zappa family trusts VAULTernative records. VR2012-1. Not available on Amazon, but google it and you'll find it. The tapes have been remastered and the project was overseen by Magic Band members Denny Whalley and John French, who both played on the album. Quality is a zillion times better than Dust Sucker & son. 3 bonus tracks vs SODS 9, but at least they are listenable. Packaging includes extensive notes by Denny,John and Gail Zappa. Also included is some previously unseen art work by Don.
There is absolutely no reason to buy this rubbish when a far superior, official version exists.