Hi,
I use ETA for insuring my raven tour. I was impressed with the cover and the lack of limiting small print you find on some cycle-specific policies. I've not had a claim but heard good reports about their recovery service from aquaintances. Cost-wise they are comparable to the CTC insurance scheme -I pay about 8% of the value of the bike but this will depend on your circumstances. This is still a lot of money and certainly more expensive than putting your bike on some household policies (M and S are supposed to be good) but I wanted to keep things separate. New for old, cover for damage and theft, recovery, no claims bonus, no specied lock standard, no restrictions on locations or hours were all positives.
The ethical dimension appealed to me as well.