I like the Clearly Slotted Triangle thingy rulers better then Block Lock and I thought the the Block Lock was the best thing ever. LOL If I hadn't bought them to try I never would have known I liked them better. I'm keeping the Block Locks because I may find a new use for them. I have replaced all my basic rulers with Quilter's Select. I know how durable the coating is, I found the small QS ruler in my washer. Somehow it had gotten in with a load that was washed in hot water with Tide pods. The coating was not harmed at all even while being scoured by the rubbing of the load.