how good are burnt dvd's?


I have a couple buddys of mine that are burning a bunch of dvd's for there own collection. They are always asking me if i want any or want to borrow them. My question is are they just as good as store bought ones or even dvd's I get from Netflix? Is the audio quality the same? video quality? Is it noticable? If its not recorded the right way, could it hurt my system? Speakers etc? I would just hate to spend all my time and money trying to build the perfect system, only to cheap out in the end. thanks for your help.
theaterhome
Well, you may go to jail or get a HUGE fine...don't tell everyone what you are doing?

Dave
It depends if they're DOWNLOADING movies and burning them. Are they ripping the DVD and compressing it into some DiVX or MPEG format then reburning it? It's probably likely that it's a DIRECT COPY burn just like on CDs. Quality... you won't be able to tell the difference if so. If it's downloaded, yes but the quality is QUITE impressive if it's a 700-1.5 gig MPG/DIVX compressed movie. The more you compress/change formats the lesser the quality will be. This also takes a long time. Chances are, they're doing direct copies.
Basically what Kgturner said. But whether you can tell a difference or not would be entirely subjective. If the movie itself fits perfectly into a single-sided DVD-R then it should be the same. But theoretically, if your compression rate is 90% of the original, it can't possibly be the same as the original. Many blockbuster action films tend to be bigger in size and if you like the movie, they'll be worth buying.