This is the link to the article comparing 7 different Columbus frames made by Mondonico. The tester could not differentiate an Aelle frame from an SLX with all said and done. Very interesting article.

http://www.habcycles.com/m7.html

My perspective is that it's all about getting out & riding! If a $75 bike from Craigslist get you out & riding, It did it's job.
If a $7000 carbon bike makes you ride, It's worth the money. If being a fan of great workmanship makes you happy, be happy with that.