When buying a blender, there are a few key factors to consider. First, assess the power and speed options. Look for a blender with a powerful motor to handle a variety of ingredients. Variable speed settings allow for more control over blending consistency. Secondly, consider the capacity and size of the blending jar to ensure it suits your needs. Additionally, check for durable blades and a sturdy construction for long-lasting performance. Finally, think about any specific features you desire, such as preset programs, pulse function, or easy cleaning options.