Bests & Worsts Reviews from Amazon

So let me first explain the 4-stars. This thing is worth 4 stars based on the price alone, and what you get for the money. So onto an actual product review... Opening the package I was pleasantly surprised to see an additional flat ruler and a small Phillips-head screw driver. I was also pleasantly surprised to see that not only were batteries included, but batteries were already in the device. Using the tool is pretty straight forward, there is no trickery afoot. The switch turns on the laser, and it's next to impossible to screw up a bubble level, so they work as intended. The laser pattern switch took me a second to understand (RTFM), but it's easy to function once you realize it's far more simple than you think it would be. The tape measure works perfectly, though the operation of the locking mechanism is the exact opposite of every other tape measure I've used. Again, once I understood it, zero complaints. Now, there are two cons, and if this were a $100 tool it would result in a 1 star rating, but at $12 I'm still pleased. My only complaint is that the laser casts at about a 5 degree clockwise angle. This isn't as much an issue if you hold it against a wall to have a horizontal laser, but if you set it on a table or counter, the laser is noticeably not straight up and down. Being aware of this, I just use it horizontally and adjust for the very slight angular change caused. The other con, and it's not a complaint, is that the bubble levels aren't very precise. This is a problem with the markings on the bubble cylinders themselves, not a defect or anything, as these levels will only get you pretty close. In short - this tool is worth the 4 stars because it does what it advertises adequately enough for the price. It's more than adequate for someone looking to make sure their pictures are level and in line, but if you are an OCD type or have legitimate need for a higher precision tool, spend the money.