I’ve seen 15,000 bonus miles with first purchase and annual fee waived for the first year. And I’ve seen 20,000 miles with first purchase but there’s an annual fee right away.

This is the first time I’ve seen 20,000 bonus miles with first purchase and fee waived the first year.

In general I haven’t seen too many problems getting the signup bonus credited or having the fee waived — but it’s still a good idea to print the offer page (which mentions the bonus miles) and print the terms and conditions page (which mentions no fee the first year) just in case there’s any confusion later.