Let me start by saying these SlipToGrip mats have been a game-changer for keeping my devices secure. I've used them in my car to hold my phone and GPS, and they work like a charm. No more sliding around during sharp turns or sudden stops.

The thickness and width are perfect - they provide enough surface area to keep even larger devices like tablets stable. I particularly love how they maintain their stickiness even after multiple uses.

However, there are some drawbacks. The mats do collect dust over time, reducing their effectiveness. I've found that washing them with warm soapy water restores most of the stickiness, but it's not quite as good as new.

One major warning: these don't handle heat well at all. During summer months when my car sits in the sun, the mats became soft and lost their grip completely. They didn't leave residue, but definitely couldn't hold anything when hot.

The versatility is impressive though - I've used them under speakers to reduce vibration (with noticeable sound improvement), on my treadmill phone tray, and even to secure knitting patterns during road trips. The six-pack is great value since you can use them in multiple locations.

For the price, these are fantastic temporary solutions for anti-slip needs. Just don't expect them to last forever without maintenance or replacement in high-heat environments.