Currently use QC to make custom layers for Bonix TV - a vision mixing kind of application for OS X with a kind of QC stack of layers, each layer being a composition with published ports and some protocols for data types. Also generate sports graphics and twitter feeds and so on for video score boards at large sporting venues.
Spent a few years learning Quartz Composer as my way back into coding from a decade away doing design related work. Film, graphics, studied Architecture for a few years and got involved in publishing then film. Now moving into front side web development. Hope to get into app dev with Vuo and rapid app prototyping.
I used to use small expression patches with the Freeboard/Keyboard patch for multiple instances but just needed on Freeboard patch with multiple noodles coming off it. I guess it just depends whether you desire multiple Freeboard patches or multiple expression patches in a QC context. Expressions are smaller nodes is all I would say in favor of that method. Probably it's no big deal either way, don't use Vuo enough to have an opinion either way.
I'll have some time over the next week (after election campaigning on Climate action) to check it out. I have a few interesting datasets I've been wanting to get into Vuo. I tend to use CSV out of spreadsheets but it's easy enough to use GREP to XMLify them.