For sciatica, get an inversion table. You can get them at Academy and wally world. Don’t buy the one on TV unless you want to blow 3 grand.
Got mine for around 150, works great.
Absolutely concur with the inversion bench; the massage chair sounds more like dealing with the symptoms than with the cause.
You don’t start completely upsidedown, just enough for your feet to be above your head and for just a few minutes at a time.
Nevertheless, I felt immediate relief and after the third session or so was about 85% pain-free. Still use it for the occasional twinge.