This is from the Clek FB page:
Hoping for a good fit with DS3!
Although individual circumstances result different solutions, please know that Clek encourages you to keep your child in a 5-point harness for as long as possible.
We will be introducing our own convertibl...e seat later this Fall (2011).
Meanwhile, choose a harnessed seat for your child until they safely fit in a booster seat.
Hoping for a good fit with DS3!