I've got a catleap.
Btw it's 1440p, not 1600p, so you'd be going from 16:10 to 16:9.
I have two 24" 1080p screens on the sides of the catleap, and to be honest, I almost never use them.
I just throw my background programs on them and use the catleap for everything else.
The extra res is awesome, BUT it took a while to get used to for games.
It's hard to explain, everything just felt far away.
So, in conclusion, I would not trade the catleap for 3 1080p's; in fact, I'm saving up to buy two more.
One last thing to remember, of the six my friends an I have bought, two each had a dead pixel, and three have backlight bleed on a full black screen.