I used to use LightScribe last year, but not on a Mac.
I suggest finding an inexpensive printer that will print on CDs. Generally, the printer will print faster. LightScribe high quality graphics took 10 minutes, and the contrast is poor (light gray being "white", a somewhat darker gray being "black", as well as not being color.
My printer takes about 45 seconds to print full color, high quality onto a printable disc. There's no comparison, it really pops compared to the dingy lightscribe, making lightscribe look very unprofessional in my opinion. I think printable discs are cheaper than lightscribe discs too. The look is more consistent, some lightscribe discs clearly had more contrast than others. The only advantage that lightscribe might have is that it doesn't require a printer and it won't ever smudge, the printing on a printed CD/DVD might smudge if you get it wet.