Great product once again by evenflo! This is the 5th evenflo exersaucer I've purchased in 12 yrs! I searched the web for weeks for an entertainer and came across this one. It was the only one out there that offered all the features I was looking for. Unfortunately no one had written a review on it so I was a little nervous to spend the $149.99. Especially since it was nothing like the evenflo smart steps I previously owned with my (thought was last!) baby. Well my 5 month old LOVES THIS!!! The 3 music stations do interact together while attached to the unit (not sure how really). And the bar across the top has music as well when you pull on the plush instrument toys. Also allows me to attach other toys to it as well. She loves all the teethers and bright colors. I thought by the photo that the bottom floor base was like an exercise ball, but its not. Its made of plastic and the underneath is hallow, doesn't add "more bounce" but does help with balance developement. This does seem to take up slightly more room then the a traditional exersaucer but well worth it! It also doesn't fold or come apart for storage or travel, which I use to take my other one with me when going to bbq's and other outings. I can get this outside on my own though. Also the photo on amazon shows a circular bottom, but it is actually triangular. This is better in my opinion because it fits nicely in a corner! Look no further, this is the one!