I understand the convenience of these small heads, TC, Ampeg, Aguilar, GK, GB, MB etc. especially if you ride a bicycle. I even ordered the PF-500, primarily looking for a small backup for tube amps. I realized I have to carry it and whether it's on top of my cab or in a case, I still have to move it. A power amp (I'm using a Crown XLS1500) has way more power, ohm and cab options, these mini's just aren't worth the problems people are posting on TB. Yes, you need a preamp either racked or in pedal form, but it's worth it. PF-500 cancelled. Call me when they have one the size of a pack of cards, that works.