Though I chose super-saver delivery, these were delivered within three days of purchase! Both back and front brackets were very easy to attach and the lights clip on and off very easily. I would recommend these lights for people who are cycling in built-up areas that already have some street-lighting. "To see and be seen" is the saying, but the front light (while it is very bright and makes you visible to traffic and pedestrians for hundreds of metres) would not, on its own, light up a very dark street or country lane. Both of them benefit from three different settings (alternating, flashing, permanent). Before I bought these lights, I read a review that stated that the plastic holder was flimsy and snapped on the first day. I can only assume that this is an error on the user's part - perhaps too much force - as the light holders are sturdy and have not yet (touch wood!) suffered any damage. Considering the price, the included batteries, sturdiness, removability and easy-attachment*, it is a very good buy and one that I would highly recommend.