 I bought it new w/ 7 miles and it was the 1st new car I ever bought.  So far it has given me no problems with the exception of the driver side window going up very slowly.  Pushing the window forward fixes it until you bring it down again.  My A/C went out (high side pressure line) and this is VERY common on the xterras and actually pisses me off.  When I went to the dealership the girl in front of me purchased the same part and when I was in line paying a guy walked by and said "oh, you must drive an Xterra" If it's that common issue a recall.  Mileage is okay and I can actually tow a little more than expected.  103k miles and I'll drive it till she dies.  hopefully 300k!