Depends on what you want.
I think long term it will prove to be a good buy as they know they have to improve the infrastructure around Aldinga.
I know there was recent talk of a business hub being created and the rail link is expected to continue down to Aldinga at some point.
Have you looked at Maslin Beach this would of been my choice but the wife and daughter chose Port Noarlunga Sth. Personally I think its a lovely little area that doesn't look as if it can be developed too much more.