Yes. If my bike is in motion, I have headlights and taillights running. If it works for 18-wheelers, and daytime-running lights are standard on cars, and required on motorcycles, then it's also good enough for me.

DiNotte and MagicShine are really the only ones that are clearly visible and attention-getting from a distance in full daylight. Others are kinda sorta if you're looking specifically for them from only a couple of hundred feet or less. At 60MPH, 88 FPS, 200 feet is just under 2½ seconds. How long does it take to send a text? I want at least 15 seconds, or a quarter-mile to be seen at 60MPH. The DiNottes give me over twice that--a good half-mile, or 30 seconds, during the day.

I own DiNotte 300R and 140R lights. Either one is fine, the 300R is easier to mount and move from bike-to-bike. I also own the MagicShine, but it works best as part of a package with MagicShine headlight, and it's a bit of a pain to mount and aim on a seatpost. But it's cheap.

I've had motorists at a stoplight roll down their windows and thank me for using such a nice, bright taillight during the day. I've also had cyclists ask where to get one. In six years of daily riding, I've never had a complaint that it's too bright. I do turn it off in group rides though.