To answer your question, decasere; Yes. The Ashton VSG and the Opus X are worth it --IF-- your palate has evolved enough for you to enjoy a real full-bodied smoke. (also, make sure you don't smoke either of these on an empty stomach) If you are ready and price is a factor, I'd suggest you try the La Escepcion (in my opinion, VERY similar to the VSG in taste), the Cusano Xclusivo (IMO very similar to the OpusX in taste) or the Camacho Corojo instead.
If you're still working on mild-to-medium-bodied smokes, then I'd suggest you get through the solid mediums first. Once you're into the medium-to-full-bodied smokes, I highly recommend the Padron Anniversario Maduro, it's another expensive one that is worth the price. After this, you should be ready for the VSGs and OpusX's of the world (I prefer the VSG over the OpusX though I would NEVER turn down an OpusX).
Hope that helped.