Usually when I buy from an artist's website, what they're selling is currently available and I don't have to wait any longer for it than I otherwise would. Even if it's an advance order, I don't get it later than anybody else when it shows up, and sometimes it shows up earlier. Depending on the artist, they can sometimes throw in additional goodies if you buy right from them.
The only problem with these is that if there is a defect, it can be more problematical to return, which is why I still buy a lot on Amazon.

