I ordered a freetime and 4.0 from the seconds sales. They messed up my order and sent me 2 freetimes. I love my freetimes. I use them for at night. For the most part they work well. The only time they leak is when he is in between snap sizes. Both of the seconds I got are velcro, so I'm hoping that will help. I wanted the 4.0 just to try. Thought it might be fun to try something new. I was also hoping it would give me another night time option. For those who have both which one do you prefer? Should I go through the hassle of returning it or just keep it?