Reviewing the new Mac Pro has been an interesting challenge. It’s very much the product that professional Mac users have been asking Apple to make for years: a modular, high-performance Mac tower. And demand for such a machine is well and truly pent up: Apple’s last Mac Pro came out in 2013, featuring a daring cylindrical design that the company was unable to update for years because of thermal issues. After much consternation about the future of the Mac, Apple admitted it needed to start all over with the Mac Pro in 2017 . Two and a half years later, we’re looking at one of the most precisely and cleverly engineered desktop computers ever made. I have been dying to review it. At the same time, the Mac Pro is not a single product. There are no stock configurations aside from the it-has-to-start-somewhere $5,999 base setup, and the machines won’t be sold in the company’s retail stores. Apple’s expectation is that customers will configure almost every Mac Pro to order, all the way up to a top spec with a 28-core Intel Xeon W processor and two AMD Radeon Pro Vega II Duo GPUs that hovers near $54,000. Simply figuring…