i use the gigarec option with my plextor premium drive on almost every compilation that i burn : SVCD,VCD,Audio CD,Mp3 Audio CD,Data CD ( mostly .avi files, last days also .mp4 files ).
i use the plextool progie only to switch it on and then i run
Nero Burning Rom for actual burning.
most standalone dvd players can play any of the above mentioned formats up to gigarec 1.3, some of them even 1.4 ratio ( tried Thomson ).
i always burn these compilations at the lower speed and sometimes i turn also the varirec option on to +1 or +2.
the maximum data amount i have succesfully fit on one medium was 1.22GB on 870MB 99min Multidisk CD-R.
greetz