seems that there are mixed feelings about the R2.5 and R3 on this forum.
I am looking at a used 150 miles. R 2.5 a 2004 model and I ran the serial number at Cervelo to see if it was a recalled unit and it said it was not.
Is there any way they will provide warranty if it comes apart? I am guessing if the owner registered it I would be out of luck.