Does anybody use one of these?

http://www.sweetwater.com/store/detail/FG507NA

or its electric kin?

I've been stuck in the same place on the geetar for years. I can hold my own rhythmically and have a decent knowledge of basic folk/rock chords. I accompany myself regularly but would like to add leads and fills to my playing.

Do you feel the Fretlight would help with learning these skills?
How about traditional flat-picking?
Does it work well with BIAB?
Is it just a gimmick?