My daughter likes it (I wouldn't say LOVES, but she does like it...) - and I still use it now, she's 6 months and can sit unassisted but still falls over every now and then, so I don't leave her sitting alone - our floors are hard wood and I don't want her to bump her head, so I still use it when she wants to be sitting but I don't want to sit with her. I used it with the tray as a little "high chair" when I started feeding her solids before we got a proper high chair. It is tight on the thighs now (she's 8.5 kg, heavy for her age) but I think we still have at least a few months use out of it, although she's starting to lean back/arch her back and I'm afraid she might start tipping it over in a month or two!! I haven't used it as much as I thought I would though - but I'm still glad I got it.
The only thing to remember is that the bumbo should only be used on the floor. There was this thing with them in the US where they were recalled - not because they are unsafe, but because it IS unsafe to use them on another chair or on a table etc. They had to be recalled just to update the safety information on them - but the product wasn't changed, just the guidelines. They also shouldn't be used in the bath tub.