Yes, like everything else, your perception of improvement depends on the resolution of the whole system and your listening skill.
To me they definitely sounded much better than $7 painted zinc speaker posts that they replaced, it was night and day, but those are truly awful. Tube connectors sound as good as my WBT posts. I bought them bc they were the least expensive pure copper connector with no threads. I solder them frequently and they have held up through several projects. I use them with WBT tightening bananas, not the male connectors they come with.
