Bests & Worsts Reviews from Amazon

I just opened this, around 5:08pm today. I am excited to use this for my son! I am letting it rise to the stated 4.5" and will wait about two hours (per instructions) before I measure again. My only concern were the ends of the bumper - the left side seemed rather scrunched and flat - this was the start of the roll when it was packaged. I'm hoping it will rise accordingly. The right side seems to be doing well. I'm obviously not going to insert this under the mattress protector/fitted sheet yet until it rises to where it needs to be. You can tell that it fills the length of the crib beautifully. I was a little surprised, after registering my product on the company's website, this particular product is $3+ cheaper with free shipping. Although you wouldn't receive the 2 day Prime Shipping (something I've already paid into)... it's still cheaper and I was a little bummed over this lol - I feel like it should be offered for the $22 with Prime shipping on Amazon. I'll be back in a couple of hours to remeasure and see how it does overall. UPDATE: Okay, so it's been 2 hours. I remeasured and it went from 3.5" to 4". We are 1/2" short from what it should be. The left 'scrunched and flat' side perked up some more. I measured this and it's right at 3.5". The right side remained fairly the same height from when I initially unpackaged it - 3.5" as well. I'm not sure yet if I should be concerned or not... It didn't fully inflate to where it needs to be. I went ahead and installed it under the mattress protector AND the fitted sheet. My son's mattress is organic and so it doesn't have a plastic covering on it, but a fabric cover. I did notice the bumper to slide around a little - towards the center of the mattress not over the edge. My son was able to get in and out of the crib without any issues. I'm truly crossing my fingers that he doesn't fall out of the crib tonight. I am going to put a few pillows and blankets on the floor beneath him (don't mind the huge mess in his room - we are currently in the middle of a move). I just so happened to read the tag that's attached to this product and I am pretty shocked to see that this isn't intended to be used on a toddler bed. Matter of fact, it isn't recommended at all! Maybe I missed something or didn't read something I should have before purchasing? I am still going to use at my own risk. I hope it turns out okay.