I bought my Bighorn Irmscher quite a few months ago simply on the basis that I loved the look of it. Unfortuantely the autobox failed within a few miles of picking it up, refusing to find any gears above 2nd.. I'm not the kind of person to give up easily, so I spent a fair time working out the problem, treating the box with the magical Lucas transmission fix etc. Turns out that the oil cooler was blocked solid, causing out of spec line pressures and overheating. Blew it out, disconnected the slightly faulty throttle sensor and now the car works perfectly. 110000 miles on the clock, and the 3.1 diesel still puts out 32-34 MPG, so overall I couldn't be happier.
On road handling is poor in the bends, but you don't buy one of these for its road manners - it's off road where the car really excels. I've owned Jeeps and Range Rovers in the past, and I'd pick this above both the others for its off road capability, with the Jeep being a hands down winner for on road use.
If you're thinking of buying one of these, I can only advise you to be aware of the possible gearbox problem, as it seems to be a very frequent complaint on owners sites around the world - If you're prepared for the worst (took me round about 3 hours to change the ATF a couple of times and clear out the cooler), then you could find yourself with one of the best 4x4s around.