Late to reply to this thread, but here are/were my thoughts when I first received my 1/48 VF-1A (Hikaru).
Impressive box. Very beautiful and very light in weight. Rock solid and tight fighter mode. Very impressive transformation sequence. Hard to transform at first, but it got easier with practice. Small 1A head in battroid mode, relative to the wide chest plate. Stiff front landing gear doors. Very secure missile attachments to the wings (unlike the 1/60's, whose missiles often fell off or could not be put on properly). The thin upper arms in battroid did not bother me. Very impressive Gerwalk A-stance, mostly because of the above knee rotation point. Very posable in battroid and gerwalk modes. My only complaint is/was the difficulty in removing the intake covers with fingernails.
When I received my 1/48 VF-1S (Roy), these additional thoughts occurred:
The larger and very accurate 1S head made the battroid my favourite mode. The larger head no longer made the chest plate look as large (relatively). Despite many people hating the vertical seam down the head, I for one do not notice it at all, as the seam is pretty narrow to the point that it is not really visable (at least on my toy). I knew about the crooked skull symbol and loose cockpit before I got it, but they do not bother me, as I usually leave my VF-1S in battroid mode.
Now, I am eagerly awaiting for my low-vis VF-1A and fast packs to arrive.
I have definitely lost a lot of interest in the 1/60 line. I find that the 1/48 line to be superior in virtually every aspect. When I look at the 1/60 battroid and gerwalk modes now, they look obviously "cheaper" in quality(which they very much are financially). The 1/60 fighter mode however, still looks great relative to the 1/48.