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Great Fit, Easy Install.....if you READ the manual!! We have owned the Britax Roundabout, Marathon and now the Frontier and once again, could not be happier with the Britax product. As others have stated READ THE MANUAL before installing the seat. We are currently using the seat in Harness Mode in the LATCH position and the install was very quick and the fit is very tight, "rock solid". The harness height adjuster is great as it just slides up and down - no need to remove the straps thru the carseat cover. The LATCH stores nicely in the seat as does the versa tether when not in use. I like the True Side Impact Protection of the Frontier versus the Marathon, Roundabout, Regent, etc. only have Side Impact Protection (not the extra "wings"). The only "con" I would say is that I am a little worried that the fabric will easily stain on these seats compared to the fabric of the other Britax seats we have owned. The fabric is more like that which you find a "booster" seat than that of the typical convertible carseat which is to be expected I guess given this is a combo seat. It is rougher and pulled much more tightly to the seat. I would highly recommend this seat to anyone who wants to keep their child in a harness for a longer period of time. Our child is very tall for his age so outgrew the Marathon carseat (max of 65 lbs) prior to even reaching 40 lbs. The Frontier is a great choice for children in similar situations. And it is great b/c it will literally grow with your child.