https://www.rei.com/ Specialty/Other Vertical Accordion 125 seconds
REI uses a multi-step accordion checkout that appears well organized and quick for users.
Most room for improvement is in the individual fields, There is no live validation of responses, and no numerical inputs are auto-formatted. Credit card, phone number, zip code, and CVV form fields all accept punctuation and spaces as valid characters, making actual data input a sub-optimal experience.
The REI Desktop Checkout complies with 60% of our recommended best practices.