Given Pexip is a direct competitor to Cisco Meeting Server, you probably won't get too many people commenting on in in a Cisco forum. You'd be better off starting your discussion on the Pexip forums.
But, yes, I have used it, but not with Google - Pexip has similar pros and cons to CMS for using it in difference scenarios and with different equipment, so you are best off speaking with the Pexip people and coming up with a complete design for your desired use cases. If you need help on CMS, then this is the right place, but I would recommend that you speak with your local Cisco TME about your precise requirements so a suitable solution can be put forward.
Wayne
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