On April 23, all four members of my household joined Club Carlson using the e-rewards link posted in this thread.
This morning, all four Club Carlson accounts received their 4,500-point joining bonuses. This afternoon, the points have been redeemed for miles in our favorite airline program. (4,000 Carlson points gives you 500 miles, so my household netted 2,000 miles.)
So far, a good day.
Thank you, e-rewards. Thank you, FlyerTalk.