Absolutely nothing has gone wrong with it. The only thing I have had to do is some minor rust repairs.
I purchased it from an English backpacker. I use it daily to and from work, a round trip of 30 kilometres, and it never misses a beat. It cost me $500.00 NZ to purchase.
The biggest thing I had to learn was to remember was the indicator switch is on the left of the steering wheel.
Just an add on to my review; I sold the Sierra the other day for $90.00 NZ as it failed its warranty of fitness miserably. I sold it to some young lads to use as a paddock racer.