My baby is now 6 months old and I have had her in this jumper for about a month. She loves it. I tried the johnny jump up from Walmart but it was terrible and almost put me off getting another door jumper.
This one has so much more room for the baby, she is not slumped over to the sides as there is good support and it doesn't make any noise! All you hear is baby laughing.
I only keep her in it for a max of 20-30 minutes at a time - maybe once or twice a day as I think her legs could get sore from all the jumping. She loves it.