American Express has brought back the transfer bonus and it is 35% this time to British Airways. I already transferred 20,000 points and will likely transfer more.
Avios are great for flights in South America on LAN and American Airlines/Alaska short haul in the US.
Less know but equally great is using Avios for flights on Malaysian Airlines within Asia. Kuala Lumpur to Colombo or Male (Maldives) are just 20,000 Avios One Way in Business Class without any relatively low fuel surcharges.