Which chroma-key plugin? Boris FX or NewBlueFX?

This may be a re-post but I wanted the subject to be more directly relate to via a more specific question.
We want to add a chroma-key plug-in to Vegas10 Pro as we may be doing a lot of AVCHD Chroma-Key work.
Two products have been suggested...
a. Boris FX @$299
b. NewBlue FX @ $79 (Video Essentials II)
Do any of you have any experience with either of these tools?
I read some good things about both of them over at the Cow Vegas Forum
http://forums.creativecow.net/thread/24/914474
Thanks for any comments.
PS
NewBlue is running a special for Video Essentials I-IV and three audio packages... all for $229. I don't know if this is a good deal or not... or if they are things we really need on top of what Vegas already has.
Boris is also running a special... all of their stuff for $599... if I understood the sales guy on the phone correctly. But no special on just Boris FX