Sorry everyone! It took me a little longer to get it installed securely than I thought it would....
The seat is AMAZING! I love everything about it, no real complisnts at all..baby isn't here yet, so not sure how it will fit a newborn yet.
In the manual for RF mode it says absolutely nothing about not being able to use it with the headrest in the highest position! But the highest position foe the headrst is quite tall so I don't forsee many people needing to use it RF in the highest position. I drive a 2004 trailblazer ext and the the seat fits wonderfully RF! The no retread harness self adjusts by the headrest positioning. The manual as well as stickers on the sides of the seat are all color coded and easy to understand making the seat EXTREMELY user friendly!!!
I am currently only available to upload photos from my phones internet, so not sire how to do so here, but if you go on Graco Children Products Facebook page I uploaded 2 pictures of my 4 yr 9 months old daughter comfortably RF in the seat at 37 lbs and 2 or 3 more hwadrsst positions growing room!!
Absolutely no regrets ordering the seat online before it was released in the store!!!