The Heli risers are 2", and IIRC the Murph's are 1-3/4". Both have an additional 3/4" pull back. I just installed the Heli's on my bike today and it's a huge difference over stock, but can't tell you if they'd feel much different than the Murphs.
Here's a photo comparing the Heli height to stock.
Heli should have a new kit out soon that raises the bars 3" and has adjustable pull back from 2-4". It's pretty salty though at $695.
http://www.helibars.com/photo-gallery/coming-soon-multi-adjustable-helibars-handlebars-concours14