MOTM

>Has anyone had any experience with the Encore Frequency Shifter?
>Is it worth buying? or just stick to a Ringmodulator?

I can't live without mine, I think it should be a required module. 
It's not a ring modulator replacement. And the sine/cosine outputs 
can be used as additional LFOs (in quadrature). I've got some demos 
that feature the FS with my doomsday machine (scroll down to section 
9 on this page):

http://www.tellun.com/motm/diy/tln712/TLN-712s.html