I was recently shopping for a new taillight and settled on the Cyglolite Hotshot Micro. Very nice light for the money, about $33 at REI. Very powerful with 5 or 6 different display options and USB rechargeable. Decent run times, enough to get me through a work week of bike commuting on a single charge. And very importantly, it is designed to mount on seatposts or chainstays. I almost bought a Niterider Cherrybomb until I realized that it is designed to only mount on seatposts, a design flaw with many taillights. Do light manufacturers not realize that many cyclists use seatbags that would block a taillight mounted on a seatpost?