A couple of things -
Lathe cuts on polycarbonate will supposedly last longer than dubplates. Dubplates are usually shit after 50 listens or so. Most companies who do the polycarbonate lathe cuts claim that if you take care of them they'll last as long as traditional records. Another big difference between the two is that dubplates sound as good as pressed vinyl at first, if I'm not mistaken. Anything cut on polycarbonate sounds like shit.
A shorter version of my "Welcome To Thrash City" EP was supposed to come out as a 7", and I was using Poly-Cut. The test copy sounded really muddy and I decided to abandon the concept. Depending on what you're looking for in terms of quality it might work just fine for you. I had a later project ("The Torture of Humans For The Sake of Art") that was specifically planned to be a lathe cut 7 inch and was mastered as such and everything, But by the time I contacted Poly-Cut the dude was having health problems and stopped taking orders / responding to people, This was last year so no idea if that shit is resolved or not.
ANYWAY, If you're putting out something that you don't mind having low sound quality, apparently these discs will hold up. I've done a tiny bit of research on them and never saw anything about them deteriorating at the same rate as dubplates (they're not the same thing, they're cut on different material).