I also have the Reelights (RL770 kit) on my commuter with a head light and taillight, but no seatstay lights. The lights are always-on without the worries or hassle of recharging or replacing batteries, and is frictionless so nothing ever wears out, and is well worth the $80 and the extra 1.5 lbs. The taillight is easily seen from 100 yards, and a built in capacitor allows the rear light to stay on for a full 4 minutes after the bike comes to a stop.