How did you determine that vibration was the troublesome factor? Were the SSHD's the source of the vibration due to being in a RAID array? If so, how many per array? Were the drives later re-used for some other purpose? If so, were they satisfactory or did the vibration issue damage them permanently somehow? I know, too many questions!
The SSHDs were used singly, or in RAID-1. They were boot devices not data storage drives, but the servers they were in did have large RAID arrays in them. The vibration issue was diagnosed via internal testing, and the drives did exhibit a tendency to fail prematurely when used in that environment.
We've also seen issues with other (normal, non-SSHD) drives, where particular makes/models will have a tendency to report huge numbers of "G shock" events in their SMART data. Presumably this will eventually hit the threshold for declaring a SMART failure based on that counter (though I have not personally seen one that did that). In this case it is possible that the issue is merely a mis-calibrated accelerometer and the drive is actually fine; if so, the drives will continue to function normally, but the sysadmin's management console will light up like a Christmas tree with alerts when the drives start to go over SMART threshold...
Guess all Seagate cares about is shipping large quantity of drives rather than engineering reliable ones.
Their reliability in the past 5-10 years is no worse than any of the other manufacturers (within reason).
Yeah, every vendor occasionally has a problematic model.
That said... and take this with a grain of salt... it does seem to me that over the past ~15 years, HGST has had a somewhat better track record compared to Seagate and WD. (But that came on the heels of the 75GXP "Deathstar" fiasco, which ranks up there with the Capacitor Plague as one of the biggest tech fails of the '00s. The Deskstar brand got such a bad reputation that I was rather surprised Hitachi opted to continue using the name after they acquired IBM's HDD division.)