I just finished a big project using them (some pics here) and I’m really happy with them.
Being solenoids, they are good at certain kinds of movements, and aren’t silent or anything, so depending on what you need and want, that may impact things for you.
But all the parts and bits that come with it are fantastic. In the end I didn’t use any of them and instead designed and 3d-printed a whole mess of stuff around them (which I’ll post to thingiverse soon), since I had a quite specific use case in mind.
Also the new velocity firmware (video) is really handy. Although not making a massive difference on crotales (my use case), it was useful enough to build in to my patch.
So in summary, a thumbs up from me.