I just bought 8000 Pierco plastic frames.  I had bought 3000 last year.
I like them very much.  I think they are a very good investment. The
plastic otion is  cheaper than the traditional wooden frame and
wax foundation on the long run.  Plus they are easy to desinfect
in case of disease.  They are well accepted by the bees during a honey
flow.  Like Brian, I also recommand putting ten in a super for good
results.  I use the unwaxed and have no problem to have them drawn.
Nevertheless I have noticed that weak colonies do not draw them as well
as strong colonies.  I am progressively converting my operation to
plastic only.
 
 _______________________________               ~
|_____JEAN-PIERRE CHAPLEAU______|       ~       bee breeder
  |1282, rang 8, Saint-Adrien,|              ~
  | Quebec,  Canada,  J0A 1C0 |  vice president of the Canadian Honey Council
  |  phone:   (819) 828-3396  |   ~           ~
  |  fax:     (819) 828-0357  |   ~    ~
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  |______________________________~    ~