Thanks for the prompt reply. I appreciate that the experience with Twonky products is hardware specific but have also read (in Twonky forums as I recall) that Twonky Beam supposedly works better with WDTV Live than with many other devices.
If that is the case, the other devices wouldn't warrant considering
I can also confirm that the stuttering issue on Twonky beamed videos is unlikely to be a network issue as the same videos play perfectly when played directly within the browser serving 'Twonky Beam' or when 'pulled' by the WDTV LIVE using its native You-Tube feature.
Again, Twonky Beam is an interesting concept but in my experience using it with my WDTV LIVE, Twonky Beam has still quite a way to go before it is "ready for it's close-up".