Pros: Seems to be a bit entertaining for a change of pace for the child.
Cons: Difficult to put up, hard to load and unload the child, uncomfortable seating.
I had a Johnny Jump up when I was a kid, my mom told me I loved it. So when I had my third child I thought I'd get one for him so that he could spend hours of fun bouncing up and down and getting all the excercise and large muscle training he wanted. So, off I went to Walmart. I was thrilled to find it there for under $20.00 on the shelf. Snatching it up, I couldn't wait to get it home and load my then 5 month old into it. It listed that it was for infants over 4 months old and could sit with assistance. It was also listed for up to 24 lbs. So, we were on our way.
When I got it home there was minimal assembly required. The jaw clip at the top that attatches to the door frame was a bit stiff and difficult to open to hang. But once hung, I felt it was very stable and wouldn't be coming down no matter how hard my baby might bounce. Okay then, well on our way then. I grabbed my baby and proceeded to attempt to put him into this strange contraption. The seat has a stiff bar across the front and a stiff bar straight across the back. While the seat was very deep, deep enough to hold him upright even though he couldn't quite sit up by himself. However, there was not comfortable place for him to put his arms. When I lifted his arms over the front bar, it seemed very uncomfortable. However, when I tucked them into seat, he looked cramped and leaned seriously to one side or the other. Hmmm, where do I go with this. He just kinda hung there and looked at me like I was nuts. There seemed to be no comfortable place to put him. Well, darn, guess the label saying age 4 months was a bit much. Getting him out of it was a three person job. Quite a challenge. But we did manage to get him out of the hanging trap.
So I put it away hoping that at a later time it would be more comfortable for him and offer him more enjoyment. I recently pulled it out now that my son is 10 months old and able to fully sit by himself and much taller. Putting it back up onto the doorframe was still a challenge, but again I manage to get it hung. Getting him back into the swing was even more of a challenge than I remembered. But I managed it. Even taller, it seemed uncomforatable for him. But at least he was keeping himself upright. And he could sit straight without seeming to fall out of either side. But would it be fun? He stood there for about 10 minutes, kinda swaying and trying to figure out what he was doing in this thing. With a few experiemental kicks, he realized he could swing in circles. So, after about 20 minutes, he started to move about and sway. While not exactly bouncing and laughing - he was content. When he got tired of his swing/bouncy sling I attempted once again to remove him from this thing. It was just as hard as the first time. The leg holes seem to grab. The straps get tangled in the babies arms and the bars in the front and back seem to make it really difficult to manage. But I did get him out of it with a struggle.
So, my bottom line on this is - I think it's not for younger children. The bouncing seems to be too optimistic. However, they do get to swing about. But with the trouble of loading and unloading, I don't put him into it often. I find it a bit easier to watch him on the floor or to put him in his play ring. A bit of a disappointment.