I use DVDFab for DVD burning. Yes I pay for it and YES it is worth it!
It works great for copying DVD's and does Blue ray as well.
We used to do local computer repair, and all we got were Dells' and Sonys' Not just one....more like 12-15 of them...and this is a small community.
I use an Acer used that I got for $200 and it works great(knock on wood!) I would buy another one in a heartbeat.