One interesting side effect is that I seem to be in love with whichever speaker is running. After I've re-familiarized myself to it, I think, it's the better of the two. Then I switch back to the one which has been sitting idle and shortly thereafter think the exact same thought. I take this as a sign that I have speakers complementary to my ears and how I perceive music should naturally sound.
Greetings Doug - I feel the above is an interesting an important observation and worth further exploration. I understand where you are coming from and ponder whether it is due to any of the following?
1) Level differences
2) Time delay (we can only remember differences for short periods)
3) Bias. We expect it to sound different or a certain way i.e. ESL has wonderful resolution; Magnetic speaker has wonderful bass etc.
Like you I have some vastly different speakers at home, Electrostatics, Magnetic with Ribbon, all cones etc and I find each to have a strength and weakness. One observation I'd make is that we'd like to think that we can suppress the weaknesses but then one day we play the speaker for which that weakness is a strength and suddenly that speaker becomes flavor of the moment! Just some rambling thoughts.