Here are two wheels I drew, I was roughly trying to copy the wheels off my 
radio controlled car, but I didn't actually have them in front of me while I 
was drawing.

Anyway, the one on the green background I did completely in POV (using solid 
of revolution and prism cuts) and it took a couple of hours.  The one on the 
white background I did at work using ProEngineer in my lunch break, took 
about 30 mins to model and another 5 or so to import into POV.  I would have 
added some tread to the tyre but I ran out of time!

So, after this experience, here are some points I've noticed:

* In POV it is very hard to add rounds to edges that are a result of complex 
CSG, it takes lots of thought and is a pain in the bum.  In a modeller it is 
easy to just select the edge and choose "round" no matter how wiggly or 
curved it is.
* Getting the actual shape right takes a long time in POV, unless you have 
actual measurements to use it takes a lot of trial and error to get 
something that looks right.
* Making quick little changes is very easy in a modeller, but having to 
export and import into POV every time you decide something isn't quite right 
is a pain in the behind.  The files are also very big if you want good 
quality (I think that wheel was 80k triangles or something).
* Using the solid of revolution feature it took me a while to get the 
straight edges / rounded bits right, lots of faffing around.  In the 
modeller you can just draw and see exactly what you're doing in real time.
* I can get away with drawing wheels in POV at work, but not drawing them in 
the modeller :-)

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