After living with a pair of Magneplanar Tympani's for a year, I was seduced by the new Fulton Model J, which offered deeper bass and the transparency of RTR ESL tweeter (6 of them per speaker). It took me only a coupla months to realize that what a big planar offers is more important to me than what speakers such as the J do (the midrange was reproduced by the 2-way Fulton Model 80, a real good box speaker for it's time). Back to planars!
Then there was the time I replaced my Van Alstine-modified Dynaco PAS tube pre-amp with the hot new New York Audio Labs tube/mosfet hybrid Super It phono stage, which turned out to be not-so-hot. Back to pure tubes!
Live and learn. One mistake I DIDN'T make was dumping all my LP's in the late-80's and replace them with CD's. Thank God!