Most insurance companies are owned/underwritten/agent for only a few major companies. You can still get better deals by looking around. I went with Shannons as I have all the insured vehicles on one policy and easy to, say, just add the ST1100 as being used on the road again with just a phone call.
Couldn't agree more, if you have a few vehicles, have a good track record are not a teenager then I believe Shannon's is your best call.
And by the way Suncorp also owns Just Bikes, Apia, Just Car Insurance, Shannons, InsureMyRide, Vero, Terri Scheer, Bingle, CIL, Asteron and Tyndall not to mention GIO