Well I've been told. Yes, we are with WQBE and fortunately have not had to make a claim yet so can not report from that point of view. We did find them to be 'reasonable' in price for our situation.
As for the bling - we have had things listed on the system, if it is not listed it is not covered ... although it may be cheaper to replace aftermarket items than replacing with stock (standard Ducati bits are expensive). The difference between 'modifications' (effects performance) and 'non-standard accessories' could prove to be important in the event of a claim ... check your policy details. Maybe, if it is classed as effecting performance, they could state they would not have insured you had they known
Jukie is insured for 'market value' (slightly older bike) and Betty is insured for 'agreed value' (which they determine). Although the changes are listed on their system we did not increase the insured value ... which you are most likely to feel in the event of a total loss. Apparently you can increase the insured value, if you choose, for an additional premium, but they will not cover you for the full value expended (perhaps up to a certain $ limit). If you want to increase the value I think you would have to provide them with receipts.
They started to ask for the value of the 'non-standard accessories' but gave up as the list kept going (and we really haven't changed that much).