Disappointments

The room is almost irrelevant when you do near field listening. That's how you test equipment to begin with. You eliminate the room. And if it sounds good then you add the room. Clean wall current delivery is half the sound, and few of us have it these days.

To answer the question. No, no disappointments, I read before buying and before listening, if I can audition it at all. Usually not, I buy mostly used and will not exploit dealers.

Do first wives count?
Got her home and boy was I disappointed!

I have always learned from the disappointments in life. It is part of life but from corporations that bring that i don't go back for seconds. Enjoy the music and life

I will also only buy gear I can home demo for the most part.   I was disappointed when I bought a pair of Revel m106 used and realized I liked my PSB M2 much better.   Moral of that story was don't sell your speakers before trying what you want to replace them with  side by side.  

Definitely, about speakers. Speakers are especially tough to guess right when buying unheard. They might in fact sound great but you might not like this kind of sound. I don't like, generally speaking, both panel and horn speakers. Well, at least I know that. I don't like multi driver speakers either, I want two/three drivers and two is better if they can handle it. Still, many choices.