I have a Shuttle Pro v.2 on hand from a long ago video project. Wondering if anyone is using that; and could give some feedback?
To address this original question; Yes, I've used a Shuttle with Lightroom.
I found it most useful in the library module. It took a while to set up a custom set of commands, but then it made some tasks much easier. However I didn't really find it any use in the Develop module. After a few months I gave up with it, it was only really of any use when importing large numbers of images and I don't do that too often.
The shuttles are designed for video work and excel at that as it needs a different set of interactions with the UI. Lightroom just doesn't much benefit from that hardware.
Despite having a graphics tablet and shuttle available, I still find working with the mouse fastest.