Apparently, Steve Jobs was pretty pleased with the result and even told his biographer that Intel was anyway too slow and not too flexible to offer something comparable.
"At the high-performance end, Intel is the best. They build the fastest chip, if you don't care about the power and cost. But they build just the processor on one chip, so it takes a lot of other parts. Our A4 has the processor and the graphics, mobile operating system, and memory control all in one chip. We tried to help Intel, but they do not listen much. We have been telling them for years that their graphics suck. Every quarter we schedule a meeting with me and our top three guys and Paul Otellini. At the beginning, we were doing wonderful things together. They wanted this big joint project to do chips for future iPhones. There were two reasons we did not go with them. One was that they are just really slow. They are like a steamship, not very flexible. We are used to going pretty fast. Second is that we just did not want to teach them everything, which they could go and sell to our competitors," Steve Jobs told his biographer.