Join Date: Dec 2000
Location: Charleston, SC, USA
Programs: Avis Pref+, Hyatt Explorist, Marriott Life Gold, Honors Silver, IHG Plat via MC.
Posts: 6,786
Given that on average 1000 BW points = only about $5 worth of room, it's a poor deal to transfer Amex to BW. Even with this bonus, that's only $7.50 for 1000 MR! Diners' Club's transfer rate of 1250 : 3300 is more realistic!
Another way to view it 1000 Amex --> 1500 BW --> 300 miles of most airlines vs. 1000 Amex --> 1000 miles directly on participating airlines.
Of course, it's tolerable/ better than nothing for the OP who was so close to a sWN companion pass!