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
http://www.ikmultimedia.com …cts/cat-view.php?C=stands
There are several other similar mounts from other manufacturers, and I have no connection with IK other than satisfied user.
Rob