I am a uke newb, so take that into consideration when reading my opinion. I have a KoAloha Super Concert as well as a KoAloha Pineapple Soprano. I find the Super Concert to be heavy at the head. I use an uke leash with mine, and this solves the problem well. Without the leash, I have a difficult time balancing the uke.
Otherwise, the Super Concert is a beautiful instrument! I love me some KoAloha!
Our "Concert" is actually a 17" scale. We offer it with Grovers or Pegheds. Grovers are a bit cheaper, but I usually recommend Pegheds for this very reason. Brings the balance nicely in line. (We also put a turned wooden strap button on all the models).