I would expect a cartridge with 1000 hours will soon need retipping. I don't have any experience with Miyabi, but I have had 3 Benz cartridges that each showed signs of distress at the 900 to 1000 mark. Most recently, my Benz LP was having trouble playing records cleanly that it had easily played before. It still sounded good but it didn't sound as clean as it did previously on some records. I sent it off to SoundSmith for inspection and Peter reported that it had significant wear. He retipped it and it now tracks cleanly and still sounds great. This was with a cartridge that had been treated very carefully its entire life.
Bottom line---I would be suspicious of any cartridge with a claimed usage of 1000 hours. It may still be a good deal but I would plan on sending it off to a retipper like SoundSmith for an inspection to make sure it isn't so worn that you are damaging your records by using it.
Bottom line---I would be suspicious of any cartridge with a claimed usage of 1000 hours. It may still be a good deal but I would plan on sending it off to a retipper like SoundSmith for an inspection to make sure it isn't so worn that you are damaging your records by using it.