Been using them for a long time for both business and personal --for shred materials organizing donations storage. Have bought them many many times and continue to do so
I use this product almost exclusively for moving. The boxes are a good size to hold a fair amount of stuff without being so big that you can't lift them once they're full and being all the save size they stack nicely when loading a moving truck.
These boxes are a good size for packing heavy things like books. Size makes them easy to stack. Handles make them easy to carry. One criticism: when assembling the box after Step 1 it's difficult to read the remaining instructions.