Any new Concentrators for start volumes of 10-15mL?

[Kenneth Hughes]

>Does anyone know of any new concentrators on the Market for starting volumes 
of 10-15mL?  The device I use now requires me to continually stop my 
centrifuge to decant..thats a drag.
>
Millipore has a new one which concentrates downwards.  The down side is that 
you gum up the membrane more easily (if that's a concern).  It does work as 
least as well as the Amicon IMO.

		Cheers,

			Ken H.