I've gone through 2 Mosquito Magnets. When they are working, they are very effective.
The problem is that after a season or 2 (3 if you are extremely fortunate), the red light starts to blink (usually in the beginning of the season), which indicates that they are malfunctioning. Both times I ran several CO2 cartridges thru the line as instructed. Ultimately, both units had to be disposed of. If you can justify the $300 cost for 2 seasons, this unit is for you.
If you expecting to get more than that, look for another brand.
After extensive research, bottom line, Mosquito Magnet is an inferior design. If you read further reviews, you'll see that this is a common issue.
Product or Service Mentioned: Mosquito Magnet Trap.
Reason of review: Bad quality.