We had a Scenera at my mom's, but both my mom and I really grew to dislike it.
I didn't like it b/c it was REALLY hard to install RFing and my son found it really uncomfortable (or, at least, I'm assuming he did b/c he cried in it a lot more than he cried in other car seats - he wasn't as verbal at almost 2 as he is at 3.5 lol).
My mom (who works full time in a hospital, runs miles every day and goes to power-pump at 8 pm after work 2-3 nights a week) disliked it because she had a really hard time unbuckling it. She found it too unsafe to have such a hard time using the buckle.
Being industrious and sick of the aggravation, one day my mom decided to WD-40 the buckle (DOH!) so that she could get it open easier...thankfully she proudly told me about it 30 seconds after she did it so I could then forbid that seat be used again. Anyway, I went to BRU and bought an EFTA. It was considerably more expensive (around $120) but also considerably nicer for my son and easier for my mom to install and use properly (which is the most important factor, of course). Now the EFT65s are even nicer b/c they RF to 40 lbs and FF to 65 lbs.
As it turns out, after a year plus of lovin' it from afar, I ended up liking the EFTA so much that I put it in my car full time and gave my mom my seat (which cost 2 times as much as the EFTA).
I know a lot of people here love the Scenera and you might well love it too, but I just wanted to share my not-so-positive experience using it in a similar situation to help you make an informed decision.