We have used the Safety First Bed Rail for years now. We bought it when my oldest was young and would climb into our bed with us, we were afraid that she would fall off the bed so we attached the Bed Rail to one side and it worked great for us. Eventually when she was old enough to transition out of a toddler bed to her own twin bed, we attached the rail to her bed and it is still working wonderfully. It locks on well and I love that the length of mattress that it covers is adjustable. It removes fairly easily when I need to change the sheets and is easy to put back onto the mattress. Also the amount of times it has saved me from picking up books and toys and pillows that would have otherwise fallen off the bed in the night is innumerable! My child tosses and moves all night long so it is a great comfort to know that they will not be suddenly falling to the floor in the night. If my oldest has not outgrown the Bed Rail by the time her sibling needs it, I would definitely buy this same Bed Rail again.