I went through this myself, also my system burns only the +R and +RW types. Some PC DVD units can only read / write the + versions, others only the - versions. I have learnt that all the - type versions are firmware rstricted to the + versions, while the + types cannot read / write the - versions at all.
You may find very soon firmware upgrades on the net which can convert your burner to read / write both, the + and the - versions.
The standalone players do not differentiate between these types (again...as I am told.)
Burning a DVD is a long process. You need to first download the movie and then convert into the DVD format. From there you can burn them. The rendering process, depending on what type of format you are starting of with, can take around 12 hours for a 1,5 hrs project. The burning itself is not so bad at all.
I found out that the PC does not want to be used with anything else during rendering, otherwise you see problems on the movie.