Not at all, you just need to accept they will come and go much much quicker (usually hours) and you can not take any time if you want to go or not, you have to be ready to react.

There have been two very good ones in the past few weeks

The expedia $300 off one
http://www.flyertalk.com/forum/milea...new-terms.html

And the American Airlines one
http://www.flyertalk.com/forum/milea...-cdg-sale.html

They come and they go still but they tend to go much faster than they have in the past.