Specialized Ruby/Roubaix frames -- are they all the same?

[Tommasini53]

My wife is shopping for a new bike. She test rode a Specialized Ruby with Ultregra and some DA. They are on sale and the price is nice.

I've never dealt with Specialized bikes before. From the on-line information it appears that all of the Ruby models utilize the exact same frame and fork. And same with the Roubaix models.

There's a wide span of pricing in the Ruby line, so is that just a function of components?

She really did like the bike. Any feed back on this line of bikes would be appreciated. It's always fun shopping for a new bike!!