After clocking up around 15000km on the standard wheels and suspension since new, I finally decided to take the plunge and fit a set of 17s with 30mm lowered Apex springs about 3 weeks ago.
I must admit that I was a little concerned about what this might do to ride quality, but I need not have worried. Over small to medium bumps, the ride is remarkably compliant and not that different to the standard setup. It is only when large bumps, such as pot holes, are encountered at high speed that you are made painfully aware of the shortened suspension travel. In these situations, it is possible to bottom out the suspension, resulting in an alarming BANG! from somewhere under the car. Ouch! Sorry car....
In normal day-to-day driving, however, the ride quality is perfectly acceptable, giving a sort of nuggety feel to bumps. And road noise with the new Bridgestone Potenza GIII tyres is actually lower than the standard Michelin Pilots (in Australia).
When it comes to handling, the car is totally transformed. The car sits much flatter, remains perfectly well balanced, and is oh-so-grippy in both fast and slow corners. While it was fun before, it is now an absolute ball to drive fast on a twisty road. The tyres that I am using are also very predictable on the limit, letting go gradually and with a feeling of total control if you over-cook it through a bend.
Another thing to note, as mentioned in a post above, is that traction off the line is vastly improved, with much less tendency to spin the wheels on an aggressive launch. Having said that, it probably doesnt feel quite as responsive off the mark as before due to the slightly larger diameter tyre, but this is nothing to be concerned about due to the ample reserves of power available.
I can detect no difference in the cars tendency to tramline or torque steer, and these qualities are certainly no worse than they were before.
So in summary (phew!), I am absolutely over the moon with the mods, and look forward to every chance I get to jump behind the wheel for another blast (which is every day thankfully). Go ahead and lower the car on 17s. YOU WILL NOT REGRET IT!
BTW, watch out for a black Clio on Enkei wheels appearing in the 172 gallery soon.