I've been using these little gems for burning movies from a Tivo in a Toshiba 570 DVD recorder with excellent results. There have been no write error messages and I have not seen any instances of drop-outs for either video or audio. Movies which were saved at best quality then recorded at best quality seem to be identical. The only difference I have noted is some degradation of signal when recording in SP mode or slower but I believe that is more a function of the lower quality of recording at the slower speeds, not the fault of the media. I have experienced similar signal loss when using other brands of media when recorded at SP or slower.
To date, I have not had any issues or quality drop-off when re-writing over an already used disc. I doubt I'll ever re-write enough to find the acual limitations which most manufacturers claim to be up to 1000 times.
I can confidently recommend these Maxell media.