Bottom Line: The Inspiron 13 7000 2-in-1, a redesign of Dell’s midrange convertible laptop, packs a few intriguing features, but the battery life is worryingly shortBottom Line: Big-screen convertibles are bulky niche products, but an eye-catching 4K screen makes Dell’s Inspiron 15 7000 2-in-1 a solid value in the Bottom Line: Dell’s Precision 5530 2-in-1 takes the company’s XPS 15 2-in-1 convertible and turns it into a mobile workstation with solid performance and a spiffy 4K touch screen, though like all 15.6-inch hybrids, it’s too heavy for tablet use.