Bumbo/sit me up chairs

Mary

Hey ladies! I’m a first time mom and I was was wondering about fisher price sir me yo chairs & bumbo seats. I’ve heard good things and have heard bad. Are they worth it??! And if they are what is the better one to buy bumbo or the sit me up? My sons almost at that stage and I see they are super popular but I’ve also heard negative things about them causing back issues ect and they’ll sit up on their own.

Thanks in advance