Is it worth getting a computer based Diagnostic?

[Miata2Boxster]

My 2001 Boxster base with 74K on her is in generally good shape. I am thinking of taking a long road trip this summer in this car and would like to limit or reduce risk of breakdowns along the way. I am wondering if it is worth getting a diagnostic test from the dealership despite a lack of apparent major issues? Does anyone know the approximate cost of such testing? thanks

I'll add I have not yet dealt with changing the IMS bearings. The prior owner recently had a new clutch installed but did nothing to address this potential issue.