I have the predecessor; the HD16CD, and I like it. My friend has the R16, and it works fine. Anything we've recorded together on either of our Zoom recorders sounds similar and sounds more than good enough for demo work or a promo pack. However, having said that, depending on your own preferences, I like the HD16CD just a little 'better'. The R16 works off of SD cards, and depending on how many tracks you use, the 1GB card Zoom 'generously' gives you in the package is woefully inadequate. The HD16CD uses an internal hard drive, and 80GB is more than any SD card I have ever seen.
Both have drum samples and pads for making your own drum 'tracks', and they sound usable. Both have phantom power and Hi-Z inputs for direct bass or whatever. What I don't like about the R16 is no track is automatically 'saved', where the HD16CD saves up to 10 virtual takes on each track (you don't 'erase' over a previous take).
The bottom line is if it suits you, it'll work fine, and you be making music. The little screen is not my favorite for editing, so always use the Cubase program bundled. If there's Mac drivers, you'll be OK.