I had one with a matching Crate 100 watt single 12 cab and I loved it. In fact, I sold it on eBay to fund another project and I regret it! :-) The Power Block is a decent solution for a guitarist that needs a light, powerful and simple amp but for harp, I'm not sure. I'd have to say probably not the best choice because it lacks the "vibe" factor you need in a good harp amp. They sell on eBay every day for around $100, so you wouldn't be out much to try one, but since you asked me to help you spend your money :-P , kick in a little extra for a tube amp.