I just changed the original tyres that came along with my Safari, after....Hold on...70,000kms.
The tyres still were in running condition, but I had to change it as I would be doing a lot of long trips.
The 70K was done in a period of 3 years (2007 march to 2010 July).
I rate Bridgestone as one of the best for the SUVs.
Let me add that it was not just city roads that I used, it was a mix of all, including the most rugged estate roads.
I had a flat tyre once and thats probably the only time I had a problem with tyres.
It was tyres with tube, but now I have changed to the tubeless tyres to experience the difference :)
The drawback compared to the other tyres is the looks of it,but that can be pardoned withthe performance derived from the same.