I'm so impressed every time I use their search. It understands my query and then checks all the checkboxes on the side that apply. So you can refine by checking or unchecking them. It's absolutely flawless.
The checkout experience is also wonderful (they remember your login cookie / session forever, and the process itself is more seamless than 1-Click), the order confirmation and shipping emails are informative and visually pleasing, and when the order arrives each item is annotated with the order line number and your internal identification code.
I also love their no-branding and black-and-white drawings aesthetic. It's like they're saying "we'll find you the best brand, just pick what you actually need".
They're doing amazing. I feel like a dope when I pay twice as much as Aliexpress or whatever, but I feel even better when some screw doesn't fail a year down the road and kill me.