Back to the op question:
I have a carrot that is over 2 years old. I had a problem with it just under the 2 year mark and Garrett had me send it in. The invoice said they replaced the vibrator motor but what I received back looked like a brand new pointer. It was a quick turnaround too! Other than that 1 issue that was handled well by Garrett it is still my best pointer, I only wish my Mi6 was as reliable. My carrot is always with me as a known reliable unit.
On another note, never buy an mi6 if you do not have a deus, in standalone mode it is impossible to hear with out putting your ear to it!