What is that one thing you own that surprised you the most?

The thread starts:  I was thinking the other day what is the one thing I own that I got and it surprised me how much I like it and use it. For me it is the Music Hall PH 25.2 headphone amp. I use it all the time and it sounds so good I would not want to be without one. I was not really into headphone listening that much until I got it and now it is one of my favorite ways to listen. It is for me the item I got and now would not want to be without one.

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