Rose got her islabike on thursday too. Rode it 100m or so without being held after about 20 minutes of playing. She is slightly older mind, 3 and 2 months now, and had done a ridiculous amount of balance biking. I am totally sold on the whole balance biking teaching the hard bits of biking thing now.
Also really like the islabike, you can see looking at it why it cost so much, very well built and thought out, and having carried it up the hill from the park a couple of times, the weight makes a difference to me, she can even pick it up herself, and was trying to ride it up a hill earlier. All the other ones recommended were at least half as heavy again, which is a big difference.