When we were choosing a pushchair for Ainsworth, we really only had two main criteria: it had to lay completely flat for when he was tiny and it must be able to be used so that he would be facing us when he was in it. The problem with the latter choice is it simply ruled out all the cheaper options - only the most expensive models had a rear-facing capability. But we were adamant, so we spent the extra.
And now we see we've been proven right! Research published last week has indicated that babies who spend time in rear-facing pushchairs are happier and less prone to stress.