My son (age 3) has about 1 more inch before his shoulders are even with the top slots of the RA. How long do you think it will be before he outgrows it? I've been researching seats and I still haven't decided, but feel pressured by the Britax sale ending today! So, wondering if I should just go ahead and get the Regent now, or if I might be able to wait until the next sale (or perhaps I will decide not to get the Regent at all! I'm still undecided and might go with the Nautilus).