The Lumia 950 and Lumia 950 XL provided the answer to the platform's fans starved for quality hardware and the complete flagship experience. The budget-friendly Lumia 550 that launched alongside didn't get as much attention, but served its purpose just fine - introducing the new Windows 10 to the masses.
Source: http://www.gsmarena.com/microsoft_lumia_650-review-1418.php