Take their warranty with a grain of salt. They are very good about replacing servos that may or may not be faulty but they will not replace abused servos of any age. They will also repair older wornout servos at a decent cost but not replace them.
I'm not knocking HiTec service and they do give you a good fair price on repairs but don't expect a freebie every time. I had them repair an old S-5925 digital and it ran about $70, but a new replacement was $120 so I saved $50 and got an old servo back in good working order.