Pirate Ship: CheapARR Shipping

i am not get the point regarding this app,
i entered same dimensions and weight as in shopify default shipping service.
UPS was a little cheaper in Pirate app , Priority USPS is same 1in1, usps is the same or even higher cost.
BUT this app has $100 insurance while shopify has $200 + , and according to another review it is very difficult to get ant reimbursement from insurance from this app.
+ interface is tricky, need to spend more time to process the shipment.
hmm. not sure

maybe sometimes it will be cheaper but 1 insurance claim will make this not reasonable. will play with it around more...
if you have basic plan in shopify maybe this will be a solution.
if pro plan - it will be not reasonable