We have the Hipod in both of our cars for Noah and love it. I'm not a fan of that velourish material in fact I can't touch it gived me goosebumps and makes me feel sick lol I know I sound like aa wierdo we have the hipod convertible car seats too and are happy with those (we picked those thanks to the material too lol)

So it was the natural progression to get the boosters too

Can't really think of any downsides