Yesterday my dive computer failed, needing a new battery. Sea Turtle did the job in about 10 minutes and charged me Bz$15.
I have another computer, a Suunto, that cannot be opened except by the factory. Periodically (at least every 18 months) that battery has to be replaced. A nightmare, as it has to go to the USA. Regardless of the costs and delays involved in transportation, Suunto charge around US$50.
Roll on Sea Turtle!