Zillow Home Values via Text Message

At the Inman Real Estate Connect Conference, Zillow annouced a new toy... Zillow Values via Text message. Here are instructions from their blog on how it works:

From your mobile device, send a text message to z@labs.zillow.com.
In the message field or subject line, enter an address for which you want a Zestimate, then send the message.
Examples:
2911 W Boston St Seattle WA
2911 W Boston St 98199
Tip: The format is not case sensitive and you do not need to use punctuation.

A text message from Zillow will be returned to your mobile device within a few seconds or slightly longer, depending on the network or your mobile phone provider.
The return message will contain the home's address, the Zestimate, number of bedrooms, number of bathrooms, square footage and year built.

Is this overkill or a really useful tool for home shoppers? Who will use it most... real estate agents or borrowers? Or are mobile phone users setting themselves up for text spam?