Traxide Battery Isolators

I did look at their website while it was up and they did not get me excited. We have used the Redarc for years without a problem. They are reliable, work and inexpensive. http://www.redarc.com.au/sbi.htm
Major issue with battery isolators is protection of electronic equipment already fitted to your vehicle as standard. Redarc has no issues with spikes http://www.redarc.com.au/sbi-techspec2.htm

Also have a look at the Rotronics products try here:
http://www.carscene.com.au/newsevents/rotronics.htm
If you call Rotronics they are very helpful (Rod Street - I think)
Truckster uses a Piranah set up and reacons that's the go but I thought them a bit priceyCarpe Diem