What's the interest rate on this account? differin make skin worse Hot tech upstarts have waxed and waned in other markets. For Xiaomi, the biggest challenge may be expanding its user base while retaining the core fans. So far the focus on service and schmoozing consumers, rather than relying on hardware, suggests the hype is deserved. Raiding Google is a coup. But it will take something stickier to turn Xiaomi into China’s Apple rather than its Palm Inc.