I think the quality control issues with the Bill Taylor Ashtons have really been overstated. If you listen to the scuttlebutt on these forums you would think that any pipe from the late 90's or early 2000's was certain to be a dog, and that is far from reality. What people forget is that these pipes were, and continue to be, far more handmade than many other lines, and there is bound to be some variation. While I would agree that it is fair to expect perfection in a 300-500 dollar pipe, the truth is that thing slip through. I have owned a number of high end pipes that were not perfect for one reason or another, and just off the top of my head I can think of both an Upshall and a Lane era Charatan (Special yes, a Charatan!) that were both grossly misdrilled.
I think with all pipes you really have to go piece by piece. Often, aside from mechanics, it really comes down to how a particular maker matches your smoking style and personal taste. For example, I really like Ashton's because they are generally bored with a more narrow tobacco chamber. I smoke a lot of flake type tobaccos that do much better in that type of bowl. I am not a fan of great big, deep, and wide bowls, like are found on some of the Savinelli Autograph's, for example. I have one that I swear you can fit an ounce of tobacco into. My Ashton ELX bulldog, however, even though physically a much larger pipe, probably only holds about 1/3 as much tobacco. This is not an issue of what is right or wrong, but personal taste. If I smoked more big, springy ribbon cut aromatics, I would probably like the giant cavern on the Sav much more.
As for AShtons, I do not mean this as a knock to Jimmy Craig in any way, but for me personally, I would much rather have a Taylor era Ashton than the later iteration. I also think that if you get an Ashton that maybe reflects some of what he purportedly went through personally during that time period, then maybe you actually having something more valuable and rarer than just another good pipe. I am excited that the company still exists though, and would not hesitate to buy a pipe that I really loved. There are just so many cool "first generation" Ashtons available right now, that will probably become harder to find and more expensive in another five or ten years.