Being the recipient of six speeding tickets in three years (two coming across country in UT and NE and four in OH), I decided to fight back, so I purchased the Valentine One. It's been good, but didn't prevent a Laser generated ticket, so I entered a group buy for the Lidatek LE-30 and ended up purchasing it for $268 (and $80 for a professional installation to net an extra year warranty).
I wasn't certain the unit was functional (despite flipping the on/off switch and hearing the initial chirp.) Even in a couple of instances where I thought it should have gone off, it didn't. However all that has recently changed as the LE-30 has gone off three times in the last month, all at night.
The first was as I saw a cop car pulled over, presumably ticketing a vehicle. I don't know how the LE-30 could pick up the laser, because I was on the opposite side of the freeway and there was a dividing concrete barrier. (The unit transponder is mounted low, near the front license plate).
The second instance was on a local thoroughfare, while traveling approximately 55 in a 45 zone. The unit went off (it's pretty loud) so I immediately slowed down and turned off the unit. Sure enough, about 500 feet down the road were two cop cars, one behind the other. They didn't follow, which to me validated the LE-30's efficiency.
The third instance was on the same freeway as the first laser alert. This time the LE-30 (and the V1) went off, so I turned off the unit and slowed down from 75ish to 65, and about 400 feet later in the grassy middle between the two freeway directions, was a cop who again didn't follow. It was way to dark to note any (hopefully) aggravated/astonished expressions of "wtf?"
I believe the LE-30 has saved my butt twice now, not to mention my driving record and my insurance premiums, more than making up for the cost of the unit.