We bought this not really knowing what we were looking for, but were really pleased with our purchase. The chair is quite lightweight but very sturdy. It didn't take us too long to put it together (although the cover was a bit tricky to put on) and we've used it almost every day for the last 6 months or so.
It would be a nice feature to have it so it is easy to collapse for travel, as we couldn't fit it in the car for our last journey, but as we don't travel often this wasn't so bad. The feet section also seems a little short, and as our boy is quite big, his feet have started hanging off the end! It doesn't seem to bother him much though.
Our boy loves his chair - nice bright colours and he seems very comfortable in it. The straps are easy to fasten, but it would be nice if they were set a little higher as he has a habit of reaching out sideways and looks like he might try to escape - he hasn't managed it yet though!
We've used the vibrate function a couple of times, but to begin with our boy was confused and it upset him a bit. He seems okay now, but he's happy without it, so why use up batteries? Not a big fan of polyphonic tunes myself, but they have distracted him on a couple of useful occasions. The toys that come with it are pretty good - the two palm trees are positioned well for 'first touches' and the ears of the elephant make a scrunchy crisp packet noise which seems to excite all babies!
All in all, I'm very happy with my purchase. I only needed it to keep my boy safe during showers/making food/answering the door and for a bit of entertainment by himself and it does this perfectly. It seems very safe and I would recommend it to anyone looking for a simple and relatively cheap baby bouncer.