Ok so I just found this offer as well and then came across this thread. The miles add up like this for "BizSeat":
20k bonus + ~9800 flown miles + 25% flown miles cabin bonus = ~32k miles for the trip.
There is a $200 off coupon 200merci, leaving the round trip at almost exactly $2k with 32,000 BA miles. Is this a good deal? Economy to Paris would be less than half this price--is OpenSkies "business" really worthwhile?