The DR-85 is a nice call. Only problem you'll encounter is if you ever take it apart for some cleaning or other reason. The reeds don't have a stop which means you'll have to tune by trial and error. Take for instance an Echo poly double reed timber call. If you ever take it apart you can put it back together without a trial and error tuning.(just make sure you get the spine of the reed in the correct direction) If you're just starting out, there are some good calling CD's you can purchase to get the basics down. Double reeds sound great but if you learn on a single reed a double reed is a cake walk. For some top end calls you can look at RNT Daisy Cutters, Echo Breakers, RM Gold Diggers to name a few. Calls are an addiction from cutting reeds and cork to tweaking toneboards to get the best sound. Same goes with goose calls, get a calling CD. I learned on the 2 that Dave Smith put out, great stuff. Bill Saunders is a local guy (WA) and makes calls for basically all the dark geese. It's hard to beat his Traffic. Learn on a short reed rather than a flute or long reed.
Finally, buy a call, blow the call, take the call apart and put it back together. Learn how to turn the call. Just as humans have different voices ducks and geese do as well so no "one" tune is going to be holy grail.
That just my opinion. A great single reed is the blue Southern Game Calls Lil Joel that Ducks Unlimited used to give out as a gift for joining. Has great volume and on Ebay can be purchased for 15 or so.