I think weight and size together are important. I can lug a 50 lb amp if it's fairly square and well-balanced, but a 60 lb G-70 in a case was another story for me. It was bulky and awkward and added time and discomfort to my setup. I still miss the G-70, I've bought and sold two and could probably be talked into a third for warm weather, but overall the bulky weight was more than I wanted to handle. With my heart condition and all the meds I take, my strength and stamina aren't what they used to be. So today, if i can find something smaller and lighter that will do the same job as something bigger and heavier, I'm going with the lighter stuff.