Check your Warner Titles before plunging and buying their titles; so far,
the ones in my collection that suffered from DVD rot are Warner titles, the most common of which is Superman:The Movie, and recently, I discovered Swordfish also suffered the same fate,
so far I'm still lucky with my other Warner acquisitions that came in with both the full screen and widescreen versions, since at times only one version had a DVD rot,and the other is still decryptable,and I was able to make a back-up.
So far the ones that came from Viva & Magnavision,are still being monitored for possible DVD rot, and luckily too,the other notoriously reported expensive but defective Cirterion "Seven Samurai" is still working.
My regret is that the ones that suffered from DVD rot are the ones that I bought long ago,when the dvds were still at premium prices much like the Blu ray nowadays,and the ones that came from the sale are still intact....I hope....maybe until the next 6 months. :'(
Anyway...Beware.