The HTC U11 (originally codenamed HTC Ocean) is both the year-on successor to the HTC 10 and also the highest-end member of the HTC U family alongside the U Ultra and U Play. The HTC U11 takes on most of the design characteristics of the U phones released a couple months before it, but with subtle refinements to the glass back and metal frame.
Internally the U11 makes the important upgrade of moving to a top-of-the-line Snapdragon 835 processor, which matches the Galaxy S8. The rest of the specs round out appropriately with a 5.5-inch QHD display, 4GB of RAM, 64GB of storage (plus SDcard slot) and IP67 waterproofing. The camera has also improved from the U Ultra with a fresh 12MP sensor and f/1.7 lens that uses phase-detect auto focus instead of laser.
While the U11 may have a rather traditional layout compared to the more advanced design of the Galaxy S8, it still has a handful of advanced features. HTC has introduced an "Edge Sense" feature that lets you squeeze the sides of the phone to perform actions, which are fully customizable. It also has a refined dual speaker setup, four high-quality microphones and active noise cancelling headphones included in the box.
In the U.S., the HTC U11 is available unlocked directly from HTC and Amazon, but if you want to get it from a carrier your only choice will be Sprint.