That program is ultimately finacially underwritten by Travelers/St Paul.
http://www.travelers.com/personal-insurance/boat-yacht-insurance/yacht-insurance-coverage.aspxDepending upon the agreement with McGriff (who is a large Insurance Broker), Travelers may or may not be involved in administering the day to day service including claims.
This can be a plus especially if you are dealing with a dedicated team who does nothing but watercraft.
None the less, its possible/likely that you'll still get a policy that is on Travelers paper. Meaning their filed coverage and rate plans.
Travelers is a well respected company and I wouldnt hestiate to consider purchasing coverage if the product and price are favorable.
Just be sure that you understand the term "agreed value". Especially on a 10 year old watercraft. In many contracts, agreed value does not apply to the total value of the watercraft but rather how the policy contemplates depreciation. Mostly on partial losses.
Generally speaking,total losses will still be adjusted based on the acv (generally market value of the watercraft at the time of loss). To that extent, the policy would never pay more than the agreed value so it is important to carry enough coverage that accurately reflects the true market value of the watercraft.
Just be aware that if you carry $10K more in coverage than the boat is actually worth, it doesnt mean that you'll receive that extra amount in the event of a loss.
Agreed value in my opinion is a worthwhile option for ensuring that your partial losses (the majority of what the industy incurs) are paid without deduction. For example, if you hit a submerged object with your outdrive and need substantial repairs. Usually an Agreed value provision will not deduct for depreciation which means you can generally settle your claim pretty darn close to the amount of the actual repair minus the deductible.
As always, never assume. Read your policy!!!