I use for my commuter bike. The rear light has limited options for flashing, but it works great, and charges easily and fast. It's mounted on my seatstay and is secure.
The front light is good for visibility, not for providing much light. I put some electric tape over the top to avoid it shining up at me, and have used it for daytime rides, especially in haze or rain. Not a great light for very dark roads.
For the price, a very useful set.
I really like these two lights. While I do not commonly ride at night, I am often out at dusk and really appreciate the extra visibility provided both front and rear. I have had several lights that fell off my bike but these both mount securely to my front and rear bags. I have not yet tried the mounting brackets that come with the lights. My favorite feature is the recharging capability. The lights attach to an electrical outlet via a USB connector and charge quickly and flash green when fully charged. I am glad I found these lights and recommend them for casual riding.
I've been using these lights for about a month in the NW and I love them. I just had to recharge them after about 3 weeks of use (1-2 hours at a time). They have great rubber mounts, which allows me to easily switch them between bikes (or take off and store so someone doesn't steal them). They are insanely bright, as in will leave spots in your vision bright. I road on a familiar road in the pitch black with them and wouldn't recommend them as your sole source of light. Durability remains to be seen, but so far so good.
Bottom line excellent rechargeable lights for a good price.