Considering the car's age, the Sigma is an excellent vehicle. Its one elderly ownership and log-book history makes it an excellent buy for the purchase price of $900 unregistered. It is quite roomy.. good for long-distance driving, however the vinyl seats can become quite uncomfortable on a hot day.
Performance is adequate for everyday driving, but not for the rev-head (in automatic trans./2.0L combination anyway) with some work it can become quite a sleeper. The only modification I have is a 2.25" sports exhaust system and it has a noticeable increase in performance/fuel economy.
Rust is usually the killer in the Australian Sigmas, luckily, this particular car has only a few non-structural spots, which can be easily repaired.
I love my 'StigmaWagon' even if it is compromised in the way of performance. Purchase one if you are in need of a cheap, reliable runabout or want some cheap thrills.