Have recently purchased and am using the LG GMA 4020B.(From the same box mover I suspect.)
It does as it says on the box. Although I have not used this media yet, it will write to RAM discs. This is a better system, in my opinion, than using RW. Although the cost of the media is a great deal higher.
It installed with no problems and comes with Nero.
Check the write speeds of both if this is an issue.
As for -R or +R, my view was that my writer will be obsolete by the time the +/- issue is resolved and I will require an update.
I believe that if you are going to use it to produce DVD Video for stand alone players the compatibility of -R is better. Anyway it uses the same media as my Panasonic DVD RAM recorder used to record direct from DV camcorder.
Have no knowledge of the Pioneer so cannot comment.
Regards Brian j.