I got these to try as I really like channel blocking tools but I already have Knipex Cobras. I think this tool had a very high bar and it didn't meet it. used probably 22 times after some use (not daily), the teeth in the middle are really chipped and worn out so it doesn't really grip stubborn screws. Second, it uses a design where you open and slide the pliers to open and close. I'd rather see a lock like a Knipex as it makes more sense for a barbed and grooved pliers like these.