My dd loves her Bumbo. It was great when she was in between holding her head up and sitting up independantly.
Great now she's sitting and pushing herself into the crawling position, I can pop her in it if I need to answer the door, go to the toilet etc and not worry she's going to push herself over onto her face while I'm not there.
Handy for in the kitchen too, she also watches the washing machine
Nice and light for carrying baby and bumbo at the same time and really easy to clean
Only down side has been her chubby thighs get stuck in it, when I pick her up bumbo quite often still attached to her backside!