I have a 4D Toplight. It's a reflector and has 4 LED emitters- two in the center and one each pointing to the sides. No blink mode (as it's a German product and their laws prohibit flash/blink modes for all save service personnel).
I also have a Nite Rider Cherrybomb that has a built in reflector, but it is not as big as the 4D is.

Edit: Also of note is that the above light is not currently on the rack- it is mounted to the seat post at the binder clamp with this widget: