Berry's has a 3 year warranty on their tumbler motors and a lifetime warranty on the plastic in them. After the warranty expires, they will completely rebuild it for $20.00, including return shipping, but you have to pay shipping it to them. I've done this twice with a Berry's that I bought when they first came out.
https://www.berrysmfg.com/product/ber-qd-500-vib-tumbler-110vHowever, for longevity, go with the Thumler's tumblers. I've got two UV-18's that are at least 35 years old, and I've replaced the motors once in each of them. I also have a UV-45, the big monster, but I don't know how old it is, since I'm the third owner that I know of. That one will handle a couple thousand handgun brass at a time, but it's big and noisy. It's made for industrial use, and is HEAVY DUTY.
http://thumlerstumbler.com/vibratory.htmlMy tumblers get a lot of use, and it's not uncommon for me to have all four tumblers going at the same time for days on end. You get what you pay for, and the Thumlers are top of the line, but Berry's has the best warranty for the inexpensive hobby tumblers. While smaller, they do a good job.
Hope this helps.
Fred