I have had my B5 for a year and a half now, and have had no warranty claims. I have had two issues, one where the rear tire wore through the part of the wiring harness going to the tail light, brake light, license plate light, and rear turn signals, which also took out the front turn signals. The harness was routed under the rear fender. I repaired it, and rerouted it under the seat. That was when the bike was only a few days old. I also have had continuing problems with the exhaust header nuts/studs coming loose. I finally found a way to solve that problem. I also had a non functional rear brake, which I fixed myself. Turned out the shoes were not centered. To me, all these things would have been warranty issues on a new Japanese bike, but the Enfield is different. I would also fix the battery cable issue myself, and do it right. If a dealer fixes it, it will likely break again. Now if the engine blew up, that would be a warranty issue for me. But I knew the Enfield was going to have minor issues when I bought it. My nearest dealer is 120 miles away. And I am very much a do it yourselfer.
As far as warranty service, have you ever had to deal with the warranty on a Japanese bike? Talk about a nightmare. Sometimes the bike will be in the shop a month or more. And newer Japanese bikes do not lend themselves to do it yourself type repairs like the Enfield. I have yet to find a Japanese brand dealer that cared anything about their customers. I had a much more pleasant experience buying my Enfield than any new Japanese bike.
I get the idea that many new Enfield owners think the bike will be as reliable as a Japanese bike, and have even seen comparisons between Enfields and Japanese bikes. The two are worlds apart. A new Japanese bike will be nearly 100% reliable. I expect that from one. I did not expect that from an Enfield. I could have bought a new Yamaha SR400 or a Suzuki LS650 if all I wanted was a big single. But I find those bikes nearly 100% boring compared to an Enfield. I consider the Enfield to be basically a vintage British bike as far a build quality and reliability go, and deal with it for the wonderful Enfield riding experience, where the bike itself plays a big part in that experience. The look, sound, and feel of an Enfield are totally unlike any other new bike you can buy in the U.S. as far as I know, other than perhaps a Ural. I plan to have one of those someday as well.