a ton of terrain, nice town, great lift system
a little flat
Breck is a bunch of fun.
It's a great family mountain. I wouldn't hesitate to take my family there for a ski week. The lift system is about as effective ferrying people around a huge mountain as any I've ever seen. I understand the ski school is excellent. Breckenridge is a first class mountain. It is certainly pricey, but they back it up with quality service on a fantastic mountain.
If you are lucky enough to get a powder day at Breck, you'll appreciate the phenomenal open glade skiing. You'll also get a kick out of the old school t-bar to some great terrain. It is definitely worth considering for a ski week or day trip from Denver.