For a couple of years now, I have been running the
Radbot 1000 on the rear and
Minewt 600 on the front. I get plenty of my friends (cagers) tell me they couldn't believe how bright my headlight is during the day. They can see me coming in the complex towards them. I asked about the Radbot and one friend of mine said that it caught his eye from a great distance, since it looked like flashing police lights.
I prefer, batteries in the rear light in case they die, I can pick them up anywhere. My Minewt I plug in about once a week. I have so many things on a charger strip that I prefer batteries sometimes. The Radbot batteries last forever...I think I change them once every 3 months or so just to be safe, I have yet to see them run down completely. I ride about 1 to 1.5 hours a day.
EDIT: Now for that Serfas....wow! I like that! Time to save up some cash...