I used to use mostly the jumbo model, but lately I've been gravitating towards the dreadnought. I think they both have their uses. Sometimes I'll play chords with one and lead lines with the other.
To me the key is how the patch is setup on the HD500. Without the right amount of compression and EQ they're all going to sound kinda flat. I've gotten really good results with the JTV/HD500. To the point I sold my Variax 700 acoustic guitar because I no longer needed it.
I played at church yesterday and there were 3 other acoustic guitars on the stage. There was one song where they needed some lead acoustic work and electric in the latter half of the song. Through the pa I felt that the Line 6 equipment had the bast acoustic sound up there. Not saying the other guitars sounded bad at all, just thbh e Variax had something extra. Several people, including some of the other acoustic guys on stage were very interested in how I was getting that sound from an electric guitar.
Being able to go from full acoustic rig to full electric rig with the touch of a button is awesome. Not to mention it's changing the selected guitar and change the tuning. Brilliant!
attached one of the acoustic patches that I've done. I did tweek the eq some yesterday because the room was bright and not getting a lot of low end. So if it sounds a little dark you may have to adjust it.
Here's a video I did in my studio a few weeks ago. This a chilled out little acoustic looping improve. My signal is going VDI cable from the JTV to the 500 . The stereo outputs are run to the stereo inputs of a Digitech Jamman. From there the audio gets fed into Ableton Live that was just used to capture audio in this case.
Honestly playing acoustic on the JTV is almost as fun as playing electric