Did not give it enough time on the first go-around?

Have you ever circled back to realize later you did not give some new component(s) in your audio system enough time - possibly overlooked it too quickly on the first go-around: 

For example, i.e new speakers, tubes, or interconnect cables, maybe other "lower-level" versions you rotated out too quickly before jumping back to more familiar or higher grade ones... A few of my "best of overlooked" are below. 

Care to share some of yours?

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Tubes: 

• Tung Sol KT120 output tubes / new reissue Tung Sol 6SN7GTB

Interconnects; 

• Analysis Plus Copper Oval-In single ended RCA cables