Only valid for active forum users. Active means at least 30 postings within the last 30 days (no spam postings). This will automatically being checked at www.starbike.com shopping basket so make sure that you are logged in at the WW board! If there does not appear a WW discount position when you check out you do not have enough postings!
I want to say that they use the same interface as SRAM so you could use any currently released spider based powermeter. Someone can fact-check the interface though.