I had the plie wand when they released it in the monthly box the first time. I didn't like it.
I don't usually have any issues painting my nails or need much, if any, clean up afterwards... but it came in the box so I gave it an honest shot. I do have nerve damage in my hands, and randomly get bouts of twitching in my fingers on and off. So when that flares up I tend to get more painting issues like uneven coats and paint on my fingers. My brushes don't slip though. When my fingers twitch it is like a shot of electricity jolting them quickly, but I don't lose grip--just spread messy paint, lol.
It is bulky, clumsy, awkward at first use. I tried 10 manicures with it, I never felt it got any better. It felt like it never bent right for how I paint, and when I tried painting differently it looked terrible and took me forever. I didn't feel I had much control over it. I also didn't like the super short brush stick, and had more issues than ever with paint dripping down and pooling on the nail.
I thought it did okay for my toes, helped with the reach, but in the end I didn't favor it for that either because I didn't have enough control to do a decent job.
But if your main problem painting is trembling hands that lose grip of the brush letting it slip, I don't honestly think a plie wand will solve your problem.
I like the golf pencil/regular pencil analogy above... but more along the lines of: if you hold a golf pencil and your hand trembles/losing grip.. is holding a longer one going to stop your trembles? It might help with the actual brush strokes (just as in regular painting), but it wont keep your hand from losing grip when it trembles. Like if you took a long pencil, and cut it 1/4 way from the writing tip, so the other 3/4 is bent-angled over your hand, is that going to help you? That's about what the plie is, only nail polish. It has limited rotation/flexibility that sits away from or against the crook of your hand, with all the weight at the brush end. I know some ladies loved it, but I've read a lot more reviews saying it wasn't worth it or they didn't like it. But you never know sometimes until you try it!
/emoticons/
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If you're going to buy a box anyways, and if you can get the plie wand for not much more than you would normally spend... I say try it if you're REALLY Itching to, but don't go in with unrealistic expectations. I wouldn't spend a ton of money just to try it though.