Hmm... Seems that 48x burns are OK:

The average C1 is 0.4 which is pretty low.
Edit 1: BTW, maybe the title should've read '"Excellent"...' (in quotation marks).
Edit 2: And here are the results for the LightScribe media from Verbatim (the title of the thread is suitable now

):

Although a bit higher C1 average (1.2), still a good quality.
Conclusion: Low speeds don't always mean better quality.
Edit 3: Just noticed that for all images except the last one, the black line denoting the end of the disc is missing. No idea why Alt+Print didn't capture it.