Ditto that a cheap second bike is the way to go. When my first son arrived I kept my custom racing bike and pulled an old Schwinn out of the neighbor's trash and rebuilt it with a seat. After two more sons I gave the bike to a friend that had a need. A lot of happy memories on both bikes. I still have the racing bike.

If you can't help yourself and must buy something, that moto is a terrific bargain. There are also 105 and Ultegra versions.