I've bought 2 Taylors recently, and they are both fabulous.
My first was my 816ce. The boys in the shop told me they didn't fiddle with it at all, and I haven't touched it in the +/- 9 months that I've owned it - everything about it is just perfect.
The second was my Mini Koa. I couldn't find one anywhere to try (I'm in Belgium, and I looked here, in The Netherlands, France and Germany), so I did something I wouldn't normally recommend, and bought one blind. But straight out of the box it was also perfect, and I haven't felt the need to tweak anything since.
So based on my experience, Taylors are not just good, but consistently good. I guess if you're looking at the 600, there might be some aesthetic variations, such as the wood graining, the twinkliness (is that a word?) of the abalone etc., but the build quality should give you nothing to worry about...