I've started keeping an eye on what pros ride. Not that I'll ever race, or have pro $$ bikes, but like you find it fascinating to watch the design/technology evolution.

Ironically we got my 12yo 5'0" kiddo's bike (a nearly new 15.5" 2011 Spec Hardrock 29er sport disc) because a women had bought it to race from one shop, didn't like and traded in at another. The shop owner made the comment, "she discovered 29ers just aren't for racing".

Huh...

This was a week or so after I'd started seeing mentions of that new Spec WSD 29er HT (Fate?) on the podium. Since then Rebecca Rousch wins Leadville on it.

I do find it interesting that they are also getting full suspensions down in weight to make them good, viable options for racing. Something to keep watching, as that technology flows down to mass market. I'm currently thrilled with my 29er HT...but could see if I keep riding as I am, in a year or two adding a 29er FS to the stable!