The Electrolux Pure i9 sees and avoids potential obstacles while it cleans your floor.
If you're looking for a simple stick vacuum with exceptional performance, save some money and get the $180 Hoover LiNX. The $500 Dyson DC59 is a great high-end option if you want a variety of brush attachments and other special features.
The Ergorapido is a nice-looking, easy-to-use vacuum that's in the wrong line of work. It's a vacuum cleaner you'll enjoy taking out of the box, then want to put back into the box once it starts struggling to actually clean your floors.