I have the Line6 hd500 for quite some time. But I have no amp and use it just at home for practicing / recording with my headphones. You can get very good sounds but definately must invest some time in tweaking in order to get good results. The factory presets are all crap. I also find that the results depends very much on the gear used. If you download some tones from customtone you will need to adjust them to your taste and guitar used. I ended up to build the desired tones myself using the Line6 edit software.