Hi Decambla and welcome to the forum!

Not too sure about Australia but...my UK car is a 2001 and has 2 3 point belts and a lap belt in the middle.
I had a Britax club class forward facing seat that could be used with a lap belt or a fitting kit.
Obviously no problems with 3 point belts.

Servicing can be a little pricey for some things..especially the cam belt change on a V6! So check that it has been done if the mileage is nearing 45-50,000 miles.

I have had certain problems with mine that seem to be common on the early models...front suspension drop links, suspension bushes, ABS rings on the front driveshafts.

Economy? My 2001 2.7 V6 Auto does around 18-20 around town on very short runs and upto maybe 30 ish on long motorway runs.

I find it to be a really nice car and very comfy to drive.

I hope this helps.

Dave