I have a fisher price booster seat type highcahir I guess you'd call it. It looks like a high chairs but with no legs. It has 2 seatbelt straps that secure it to a dining chari. It has 3 positions of recline for their growing ages (newborn, older and toddler) and a 5point harness.
I LOVE IT. The chairpad comes off for easy wiping and when they are big enough you take the back ff and it's like a regular booster seat. I love that Darcy can actually sit 'at' the table IYKWIM?
It's very stable and secure and I just didn't have enough room for a highchair it the time we bought it so it was great. It also means I could plonk the chair around with me wherever I wanted to go...but was still safe for her.