I wanted the smallest amp I could get for travel but was afraid the 75 would not have the balls I needed. The 150 came in and I really like it but went to GC to try the 75. I was amazed at the power and tone out of the 75 and for what I use it for it is plenty loud enough and pumps enough low end. So, I am swapping the 150 for the 75 and really enjoying the amp.