I currently have 3 and 3 on order. I started with a concert Pono, then added a soprano Pono, then decided to get a tenor, and upgraded to a ko'olau. You know where this is going, right? I have a ko'olau baritone ordered, which will give me the four basic sizes, and I also ordered ko'olau soprano and concert, which will result in my having excellent ukes(ko'olau) in each of the 4 sizes, plus pretty darn good(pono) soprano and concert ukes for travel, etc. What you can guess is that I have fallen hard for this wonderful hobby, but what you should also know is that I plan to retire from the postal service this summer, shortly after completing my collection.
Right now, I practice on my best uke (ko'olau T-1) every day, and I alternate the soprano and concert, so I take 2 ukes out of their cases each day. When the others arrive, I will figure out my favorite and play it every day, while alternating the others. On weekends, I plan to take them all out and play as the spirit moves me (that's what I do now with the 3 I have). This looks like way TMI, but I was thinking, based on what I have read here, someone may actually be interested!