When you consider most parts that break on any bicycle are due to misuse or poor maintenance, no brand or store will warranty that unless they want to for good will or you're an important customer, spending a lot of money every year. So the only thing to really worry about is a catastrophic failure of the drive and battery. Not a small thing, I know. What percentage of new ebikes, of any price, have complete failure?
Well taken care of, I think the odds are in favor of it turning out well. 51 to 49%? 75/25? Gotta be at least 2 to 1 of it working out