Wow, Ana, those are AWESOME!
In response to your question, I suffer from buyer's remorse constantly, and not just on impulse buys but on things that I've stalked, run past YLF, etc. I pull the trigger and immediately regret the decision and hope that the item will be awful once it arrives so that I can return it with ease.
Occasionally it is (stink dress) but for instance my new Docs... I ADORE them. I suspect my black blazer, scheduled to be delivered tomorrow, will likewise be awesome and not going back.
One thing YLF has helped me with immensely is willingness to return items. Time was, stink dress would have stayed because it was cute and maybe it would stop smelling. Now I know if I'm not dying in love, it goes.