Cons: Price, size
I'm not going to describe this item, as it is pretty self-explanatory, so I will just give you my opinion.
When I had my 7th baby (over 2 years ago) I decided I wanted to try one of these jumperoo things. However, I did not want to pay the price, as they were quite new. They have since come down in price a little, for the basic "model." When a gal on local tag sale list on yahoogroups posted she had a like-new one for sale for $25, I rushed over to pick it up. My son, who was 11 months old at the time, was a bit big for it but he enjoyed it for a few weeks, as it was new to him. I
Fast forward.. I took the jumperoo out for my youngest baby a few weeks ago. He's now 6 months. We don't have too much space so I alternate between the exersaucer and the jumperoo (now that I have packed Mr. Bouncy chair away). My son likes it, I wouldn't say he loves it. It is pretty basic so he does get bored easily. It does occupy him long enough for me to unload the dishwasher or fold a load of laundry. I do not feel it will hold his attention as he gets a little older, though. But at 6 months, I don't expect it to. All in all, I wouldn't pay full price (and I didn't) due to the short time your baby will use it. But it's a nice little contraption if you have the space.