The LD1100 isn't anywhere near as bright as more modern designs like the smart. On flash mode becuase the rows are not syncronised, it dosn't appear to flash at all if you are further than 50 yards away (like most approaching traffic). Its battery life is woeful. Becuase it uses the same clamp design as the lighter units, it snaps mounts all the damn time.
I used an LD1000 and an LD1100 for quite a few years commuting. The only good thing about them is they're fairly robust, both of my self ejecting units managed to just about survive being driven over by a Ford Sierra or kicked around a NSL dual carriageway.
I don't use them anymore, I use a smart and a mars.