Jitter and Benchmark tests on cddvdspeed - important?

Hey just wondering if i should be doing these tests on my burns???

Right now i do the disc quality test because i heard that was the most important and i try to keep my pi failures below a max of 4.

But what about these two other tests, should i do these also, and if so what should i look for or try to keep the burns at?

oh yeah. and what about scan disc test. if i had 1% damaged or bad on this test, does that mean the dvd drive cannot rip or read this dvd because it is 1% damaged or bad? and should i make another burn?