Both aluminium and steel have their own merits and demerits.. Aluminium has the weight advantage.. Steel has the cost advantage.. Aluminium cases are quoted to produce more noise and vibrations (although I've not experienced any of those with my case).. Aluminium cases also tend to go by recommendation in heavy humid climatic places (like near sea) as they wont get corroded.. The list goes on.. I've owned quite a few cases up until now.. The PC A70F is my first all aluminium.. If You've seen and liked it in photo, you are sure gonna love it in person.. Quality wise, no other case manufacturer comes close to Lian-Li.. I was in the market to get a full tower for myself and initially had the idea of getting an Antec 1200.. But one look at this and i dint needed a second though.. Its just so damn good.. Like i mentioned before, it has loads of room, very efficient and quite cooling and looks big and gorgeous (may be a little understated to someone's liking).. Now am looking up to get a case for my gaming rig and the PC A77F is on top of my list.. Sadly, its not available with the local dealers.. You should definitely look at it in person and compare to the other popular cases side by side and build up the idea for yourself.. They are sure pricy but then, such quality should not come cheap also..