I've actually have seen hub-printable Maxell 8x's at those Super Walmarts just recently. The DVD-R (at one store) was Made in Japan. Most likely it has the MXLRG03 media code. At my local Walmart, they were just stacking some Maxell DVD+R hub printables.
I've probably used 200+ Maxell dvd-r (non-hub) white printables, and they are superb. Print surface is excellent. Burn quality is as good as their branded media. I can't speak for their hub printable versions....they never used to make them (and I'm still a little suprised).
Verb's - MCC, are what I've used for hub printables and they are great too. Though, I've yet to see any Verb printables in the stores.