My 2006 Specialized Tarmac had been a great bike for me, serving faithfully for several thousand mile over the course of ~6 years worth of rides.
2006 Tarmac Comp (at the shop where I bought it)
But during a recent tune-up the tech discovered that the frame had a crack in the lower left chainstay right behind the bottom bracket. This was especially disheartening as I was about to head out of state on vacation, which included a Century ride (Capital City Century) in Springfield, IL. I ended up leaving my bike with the shop to pursue the warranty claim with Specialized, while I used a loaner (from a friend in bike club - Spring City Spinners) to complete my Century Ride plans.
While I was on vacation, word came back from the dealer the the cracked frame would be covered under warranty -- THANK YOU SPECIALIZED.
So the Sunday after our return from vacation, I picked up the new bike (my components) on a Specialized Black/Red/White 2013 Tarmac SL4 Pro frame.
2013 Tarmac Pro (on my deck)
I've gotten in a couple of good rides, and so far I can't tell much difference. The main differences that I see comparing the two frames: no Zertz inserts in the 2013 Tarmac frame, wider top and down tubes and beefier chainstays (where the old frame had cracked).