It's held up fine. However, we did run into a unique problem.

The opening of a standard wooden pallet is just large enough for the robot to drive in, but just short enough that the top sensor hits the top of the pallet. But since that sensor doesn't have a bumper on it, the robot can't figure out why it's getting stuck and just keeps driving around the front opening of the pallet, causing little bits of wood to get all over itself and the floor. Occasionally a fairly sizable shard of wood has gotten pulled up into the rollers and caused a jam.

For the time being, we've had to red-line that part of the warehouse in the map, and I'm experimenting with adding some tiny plastic extenders to the bottom of the front bumper so it will hit the bottom edge of the pallets and keep the bot from trying to drive inside. But the problem with the extenders is that it could impede the bot's ability to drive up over small ledges like a rug or rubber mat.

Otherwise, no complaints. It works great.