Excellent unit! I live in an apartment in Fort Worth, TX. There is a problem with gnats and annoying flies outside, after installing this I had captured 6 in 10 minutes and just watched it fill up.
The stock glue trap is AWESOME! Beware of replacement glue traps that are white, they are not very sticky and many flies land and fly off.
Originally I put mine on a timer to be on certain times of day or night, but ended up just letting it stay on all the time.