Since buying my original starter set, which lasted one round, I have never purchased a set of irons without some sort of fitting session, or a putter without at least sampling it first. With the exception of a driver or two, however, everything else has been purchased based on research only. Typically a lot of research. I do factor in playability guarantees when considering something new. I don't swing freely on a monitor, so 30 to 90 days of risk-free on-course play is a far better test for me. Generally speaking I've chosen well.