I received one as a shower gift and he used it maybe three times (briefly, at that). He's sitting up independently now so there's no need for it. I'd say it's not a must-have.
Also, they were recalled for being unsafe (or maybe not recalled, but the company provided safety straps to add in), but I think that's because dumb people were setting them up on tables and other furniture. Still, I wouldn't consider it a must-have by any stretch.