I was able to make changes with regards the specs of my pc. We had already bought one for my son, and then I decided I would like to upgrade mine so I could give my other son my old pc that was still a decent build. The only thing I would say is I can't access the upgrade option for once we have a new pc, ie I would like to add a sata drive now, but the link on the website I can't seem to make it work. Other than that is was a really quick build and delivery time for both pcs and I am totally impressed. They built it cheaper than I would have been able to do. Top company, I will purchase from them again in the future if I ever need another pc or laptop building!