Akai blank cassette question

I'm planning on recording some music that's only on my computer onto
cassettes for a back-up.  One of the reasons is regarding the dubios
durability issues of CD-R's, and also becasue I miss making tapes on
my tape deck, an NAD 613.

My supply of high bias cassettes is a bit low & it seems stores don't
carry them anymore.  I remember about 15 years ago, BEST & Montgomery
Wards had the best selection of cassettes, as did many mall music
stores.  Now, most stores, even Best Buy, just carry Sony HF or Maxell
UR normal bias tapes.  It also seems as though the Maxell XLII-S is no
longer made and Sony doesn't make any high bias cassettes anymore.

Luckily, there are quite a few tape wholesalers online where I can get
a real good price on type II tapes from TDK, Fuji, Maxell, etc...  One
site has 90 minute Akai high bias cassettes for only 80 cents each:

http://www.batteriesandbutter.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=AKAIGX-90&Category_Code=ta

That seems almost too good to be true, a 10 count box for only $8.00.
However, I haven't been able to find any reviews regarding them.   I'm
familiar with their tape decks, but not so much with their tapes.  Has
anyone ever tried these cassettes?  Did you like them?  How is the
quality & sound compared to TDK, Maxell, etc...  Any info would be
appreciated.

Cameron