I've been noticing the same filters found on Crate & Barrel pop up on a few sites. For the most part, I think they are helpful in helping users find precisely what they are looking for. However, as you hover over a filter that has been used, an "X" displays EXACTLY where the dropdown affordance is usually located, making it very easy to accidentally remove filters that have already been applied.
Once we're on the topic of filters, here's an article on best practices and one that's specifically about horizontal filters (my preferred implementation).