They, ironically, got acquired by Western Digital. But the 'Ultrastar' line name is still alive, if that's what you're looking for. 'Deskstar' seems to be gone, though.
It's a wash. Modern mechanical HDDs are so reliable that the vendor basically doesn't matter. Especially if you stick with 'Enterprise'-tier drives (preferably with a SAS interface), you should be good.
Aside from some mishaps (that don't necessarily impact reliability) with vendors failing to disclose the HAMR nature of some consumer HDDs, I don't think there have been any truly disastrous series in the past 10-15 years or so.
You're more likely to get bitten by supply-chain substitutions (and get used drives instead of new ones) these days, even though that won't necessarily lead to data loss.
Considering we used to call them deathstars, I'm surprised they didn't get rid of the line sooner...