The rule of thumb is that you should replace your helmet regardless of brand/model any time you crash (This includes the POC Coron Air Spin). Crashing (or even significantly denting) ruins the structural integrity therefore theoretically reducing the amount of protection the helmet provides. Did you ever notice that during flights, many people take their sport helmets with them along as carry-on? This is because many times when you check them in, they get banged around by baggage handlers and they get dented, thus making them less effective.
TLD has a great reputation by mountain bike and motocross racers - their helmets have saved a lot of lives. If you look at Chooch's videos, he rides wearing both Fox and TLD helmets. There are a lot of great options and that POC was on my shortlist too. The main reason I chose the TLD stage was due to MIPS and good airflow.