Tried ImgBurn today. Looks good to me!
ImgBurn 2.2.0.0
Have a Sony DW-D23A drive, probably on factory firmware. (Apparently a rebadged Lite-on.)
Tried cutting a double layer DVD Video disc using RiDisc DVD+R DL 2.4x media, directly from a set of source files. All went through fine until it came to finalising, when we started getting error codes returned by the drive (can't remember the error now), and generated a coaster. The Sony drives don't seem to get a good rep so I am suspecting that the DL functionality is a bit marginal. Am considering getting a more modern drive of a better brand. Pioneer perhaps?
Tried cutting a 4 gig ISO on to one each of Taiyo Yuden DVD+R 16x and Taiyo Yuden DVD-R 16x, and both were fine.