I'm hoping that the fact that it is not written on top of the 2 bottles of Rothschild grand cru classe means that it is very decent, not half decent, or table wine.
Yes. My average bottle price is around £10, with £25 being my (rare) top end. As screw tops are fairly new, they only top young wines. As good wines improve with age it is still hard to say if screw tops will allow a good wine to develop in the way that natural cork does. So your question...