Summary: First of all, I spent the extra money hoping to get a booster that I could use in my 2010 GMC Acadia. I have 3 small kids, 2 in boosters and one in a FF car seat. We simply couldnt make all 3 fit across with their current seats (2 Graco Turbo Boosters and an older Graco something). So we bought this expensive booster AND the expensive Sunshine Kids Radian (which is touted as the narrowest FF seat on the market).
Summary: Nice seat but it doesn't fit my Jeep because the seat belt latch will be blocked by the booster seat. In the Dodge Caravan the booster seat requires allot of force to get it to snap into the latch.The curvature of the vehicles seat is to blame. Definitely try before you buy.
Summary: We've had the Clek Olli for a few months now. I think the LATCH attachments it has are pure genius -- much easier to deal with than those on our Britax Marathon. It seems pretty comfy for my daughter. Love the little bag and the transportation straps that came with it. They'd be perfect if you take a lot of taxis or move it from car to car a lot. However, I have a few complaints. Cupholders/junk collectors would have been nice.
Summary: While its true that the Olli is easy to use and comes in a wide variety of colors, the Graco backless booster is just as good at about 1/4 the price. It also comes in a wide-range of colors to please boys and girls.