Alex was professional, courteous and well-informed. When my hard drive died, he helped me choose a new hard drive for my iMac (he offered to buy it for me as well), then came to my house to install it and ensure it worked. Replacing the drive on an iMac is not for the feint of heart, but Alex was competent, friendly and fast. He even cleaned my screen while it was apart. I would highly recommend him for this type of operation on your most trusted computers.