Incredibly easy. The bowl which is located at the end opposite to the mouthpiece has a magnetic cap where you just pop it off. It will not come off unless you push it out.
Like so
Yeah DaVinci is a great device, but it's just too big in comparison with the Pax. But don't just take my word for it. Read up on the different vaporizers and see which one suits you best. Another one I was looking at was the Solo (I think thats what it was called) and apparently thats a pretty good buy as well.