If it is an anchored booster seat, then it is illegal to have it in the third row because the 3rd row is collapsible. But we have had the regular booster in the back that doesn't require anchoring to give DD2 more height. I don't have a problem with the vision out of the back window - we have the rear sensors too which helps a lot if you are in a tight spot (Ie someone parking so far up your butt you can't move LOL) but there is a blind spot if you look in the rear view mirror where the small back windows are like you said, so I just use my side mirrors and don't have a problem. I honestly cannot fault it as a family car. We brought ours new back in 07 and we're just about to clock up 100,000kms in it and it's never skipped a beat. We have always had it serviced and we'll probably get quite a few more years out of it yet.