Ooo, laning in the snow:
http://www.youtube.com/watch?v=7qoWhScFdhMI've had a coiler (2.8TDi) for 6 years and have not had any real problems when out laning. I've also recently bought a 2.0i Sport with leafs. My view is that the coils will articulate better, but that is probaly because my Sports leafs are new and perhaps a little stiff.
The only problem area I'm aware of is perhaps the cooling system on the 2.0i's, as it is quite old now and the aged rubber hoses have been known to burst on the climb up the Wayfarer from the west (I know of two)
The auto front hubs can give out (as they wear), but other wise most lanes could be driven by a standard Frontera.
Lawrence