I have 2 C4s and a 4B. Very clean sounding and a surprising amount of wellie for their size. 4B, which is a larger cab, but with the same drivers as the C4, has more bottom end - an ideal single cab for small jobs. For rock, you will need multiples to shift the air. They are quite inefficient, too, so soak up the power. I use an Aguilar AG700 with mine. Add the cost of several cabs to it and it isn't a cheap set-up. The beauty of them for me is that I can take as many/few as I need. They're an easy carry - a few more trips to the car, but no hernia, which at my age (63) is a definite bonus. You really need to try them to see if the sound suits you. I tried out the first one I bought with a LM3 in the shop and the combination worked very well. Hope this is of some help.