Just one bit of advice for anybody stocking up on tapes these days - every single TDK, Maxell, and Sony DAT tape I have still works flawlessly. Every single Ampex DAT tape I have does not play anymore. These are Certified Mastering Audio tapes marked "467 R-90" and "467 R-94" by Quantegy. Not a playable one among them, and there are dozens of them. Buyer beware...I used these as mastering tapes, and have now lost countless hours of work.
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Having had my share of Ampex reel tape and VHS tape that became sticky, I no longer use Ampex tape, other than 641 reel tape, those held up fine.