As an update, ONN brand DVD+R disks showed up in 10 packs so I bought one. Unlike the 50 packs, the 10 packs don't include a spindle or cases. Just the 10 disks wrapped snug between two clear acrylic dummy disks.
I've burned two of the disks so far, just copies of PC data like programs and videos not intended for usage outside of a computer's optical drive. Both disks wrote well and, so far, the program and video copies all install and play as they should.
I don't use any software for checking burn integrity but for years I used to use the verify routine in Nero. Run within Windows XP and using Maxell and Verbatim CDR and DVD+R not once did any error show up. Carefully stored for years, none became corrupt. Now I use Windows 7 native disk writing that doesn't offer a verify option. All I do now is compare the total files size in bytes of the original and copy and they always show the same. Thus I'm fairly confident the writing was accurate.
As has always been my custom for saving copies of PC data, I burn at the slowest speed the writing program offers, usually 2x for CDR and 4x for DVD, and ensure no other programs are running and that my HDD is freshly disk cleaned and defragmented.
Returning to ONN disks, the packaging color features purple that leads me to wonder if Verbatim or Memorex makes them.
I'll continue to use this brand and report here on its performance. If anyone can determine who makes this product, feel free to post.