Mine is just over 2,000km and I really enjoyed it. There have been no repairs but i do clean/lube chains/derailleur regularly.
I plan to take it to a shop end of the month to do a tune-up. By then, I probably need to replace the rear tire as well and I have no experience at all with fat tires before. Hope a shop in my neighborhood can do it for me and check the brakes too.
The rear tire has significant wear compared with front. My commute is mostly on paved surfaces (asphalt/concrete and a few short stretches on gravels). At first, I thought maybe I use rear brake much more than front. So I started to use the front more often about a month ago but did not notice any difference. I am sure the rear tire wears more because it is the "drive" wheel. Like front-drive cars, the front tires always have more wear but unfortunately it is not worthwhile to rotate the two tires on the bike. I do not think it is possible to rotate the wheels without taking off the tires. If someone knows how to do this, please share.
If anyone here have put more mileage on their bikes than I did, can you share when (what mileage) did you replace your tires (rear and front)? A quick visual check on mine tells me i will have to replace the rear tire at 3,000km at latest. And probably can keep the front one for another 3,000.