I was wondering if anyone has any experience of these two amps with double bass especially but also with bass guitar? I imagine both are good for bass guitar, but I want something that doesn't cost too much that will do me for both DB and BG. I've heard mixed things about the Hartke but not much about the Roland. If it's all horror stories, I'll just save and get the GK MB150 but these two are both under £300 which is more in more range. I play a cheap Peavey 4-string, a Squier Fretless Jazz and a Stentor Student bass fitted with a Realist. Thanks for any help you can give.