I chose to buy the Fisher Price Rainbow Jumperoo because of its design; most baby walkers of this type are 'walkers' which allow the baby to move around the room. After discussion with a baby physiotherapist I was advised that both door bouncers and these walkers aren't ideal and don't really aid muscle development. I was advised the Jumperoo in short bursts wouldn't have such an effect.
The Fisher Price Rainforest Jumperoo is a great chair for building leg strength during playtime. Not easily transportable but worth it for hours of baby fun.