I have 33" Cooper S/Ts on my GU and they have done about 70,000kms. I have only rotated them a couple of times (slack, I know), and they are still fine. I do most driving on bitumen but in mud and sand they have been excellent. I am looking forward to buying my next set and will probably fit 35" since they will apparently go on the stock Ti Alloys. I spoke to a lot of people before I put them on and everybody who had them swore they were great. I had an old 85 Pajero and put them on that and they also were great. No punctures even in the Flinders where the roads are often covered with small razor sharp red shale stones. They have my vote.
They look great, grip bitumen really well and are not much noisier than the original Highway Terrain tyres that came standard. I run mine at 34 psi front and 36 psi rear. I let them down to about 28 when doing a lot of rock as they seem to flex and give a bit more. The strength in the sidewalls seems to be a big factor. On sand I let them down to 15 psi and they work really well.
I was warned by the Coopers agent here that the STT's are a bit noisy on bitumen, and not as good in the wet, so I think I will stick to the S/T for the moment.