I have both the 150 and 100 and either one works very well. If you can afford the 150 feel free to get it. The differences I have been able to hear are minimal. The 150 has a little deeper tone to it at the expense of a touch of clarity and the 100 has the better clarity at lower volumes. I had to switch between the 2 many times for a long time to come up with any sort of difference. The 150 also appears to want to play louder at which time the clarity issue is gone. There is also less drop out off axis with the VP150 by 1-2 db.
