Thing with Aires is that at first glance it looks like prety much a drop-in upgrade... But it never is. Some resarch needs to be done before every purchase.
In 1/48 scale fitting the cockpits in particular is a long process that requires sanding both the kit parts and resin itself to a paper thickness. Been there myself with Hasegawa's Phantom, Crusader etc. In 1/32 i'd say the problem is exact opposite: large resin parts suffer from shrink issues: Myself I had trouble with F8F cockpit floor and rear bulkhead, F-4J Phantom cockpit is also a bit short... But those problems can be worked around. However there are also some items that are simply un-usable - like F/A-18 exhausts with too small diameter - issue that can't really be fixed
