The Bumbo seat has been great so far. It's nice to have a way to keep my son sitting upright so that he can check out everything that is going on around him. The tray is also nice to have to hold his toys, and later on, snacks.
The Bumbo Baby Seat has been a very useful purchase as I wanted to have my 5 month old son to have a seat with which he did not have to rest on his head on something (as it is getting a little flat). It took him a few days to adjust to the seating position but now he is very happy in the chair. Just to add, that before buying this chair consider your child´s stage of development carefully as if your baby moves around a lot then it may not be suitable. My daughter (I have twins) cannot use the seat as she never keeps still and her legs are always flailing all over the place and she leans forward constantly. This means that she is in danger of falling out of the chair or tipping it over. Consequently, I never sit her in it. My son does a lot of looking around and not that much moving as yet, so the chair is ideal for him. I have just ordered the tray to go with the chair as it will be easier for my son to reach his toys.
My baby likes this seat so far although it seems to be a tight fit around the legs for my 5 month old daughter. She does have a tendency to leab forward in this seat so it's important to really follow the user instructions and monitor your child when using it. Otherwise, I would recommend this seat.