I recently tried their VIS 180 Micro. Although bright, it does not offer the ability to position it so that it points directly rearward when mounted to a seat post; it ends up facing down about 25 degrees or what ever your seat tube is. The device seems pretty well made and it sort of glows bright red and then less and then more, etc. It does not have the strobe blink like other rear "blinkies". The mounting flaw is disappointing in this USB rechargeable unit. Light and Motion suggested that I purchase their 70 lumen $100 VIS 180 which can be positioned to point directly rearward. Sure, fine, seems really bright but $100??? Discuss....