Can't add anything constructive about shooting direct to ipad, 'cos I've never tried it.
However, just a FYI about the ipad mount, as you haven't got one yet, and the mount you pictured looks a bit flimsy to me.
Many musicians have switched to using ipads instead of sheet music, so there's now quite a range of sturdy ipad mounts that clamp to all sorts of stuff - mic stands in particular. So it might be worth checking out musicians stores.
I personally use the original iKlip from IK Multimedia with an ipad 2 clamped to a mic stand, and it works very well - I've also used it for shooting video with the iKlip clamped to a lighting stand. If you want to grab the ipad for a closer look at something, it just slides out of the mount.
The original iKlip has now been replaced with the iKlip2
There are several other similar mounts from other manufacturers, and I have no connection with IK other than satisfied user.