I am totally against it. There are any number of countries that manage to give detainees housing and allow them to move around freely under low-grade supervision. It works.
I feel that the prisons should be scrapped completely, although it may be problamatic, arent they contracted from America? I heard something about them being designed and created by an american company that builds jails, which is basically what they are. You could at worst stick them in government housing in some remote town, would bring in money to the local community and also the isolation can aid in security concerns, but overall I do not think security should be an issue. I mean, everything concerning the security and intelligence sector is secret, out of the public eye, so why should they flaunt concerns now just to promote these prisons? Let the security sector handle security issues behind closed doors as it does with everything else. I am sure they are all screened for terrorist connection, and the CIA/global intelligence firms probably help with that.
The government wants to bring in more immigration to australia, which is impossible for some people as there is no 'front door' open to them, so why not just accept them into the community rather then have people wait in prison for several years just to get kicked out.