The case adds about a quarter inch to the length and width of the phone. The buttons and silent mode switch are clumsy to use. I replaced it with a better fitting case.
I love having a clear case however, with this particular one, you need to press the volume buttons very hard get them to work. I probably wouldn’t buy this one again.
Don't like this case, can't use the buttons on my iPhone 12. it's like they are not aligned correctly. I had to remove the case and buy another case that fits much better. Wasted $35 on this case. I usually like Speck too.