I'm usually a champion for Walmart bikes and in fact rode a Walmart bike almost 2,000 miles on my tour this March.
But this was one bike I checked out that I can not recommend for the price. If they would invest in quick release wheels, quick release seat, put in frame gear shifters instead of on the handlbar taking up valuable real estate, and better brakes and slap $30 more to the price, it would be worth it.
And the tires are 700x28c, thick for a roadie bike I think. If i had $150 to spend on a Walmart, I get the Schwinn Sidewinder. That's what I used on my tour and not a lick of problem with it.