I use ionto for my hands. It usually takes about 7-14 days of 20 minute sessions per day before I see results. Once I get it takes effect, about every other day is good or every third day for maintaining it.
I had a pretty crappy drionic unit for awhile, until I decided to build my own. It's really nothing fancy. Just alligator clip test leads, 2 rechargeable 9-volts, the 9-volt connectors, and two disposable square pie pans. You can find these parts on Amazon for $20-30 including the batteries, and the pie pans at the grocery store for like $2. I bought a pretty good smart charger for $22 or something on there as well. I'd estimate around $50 for this setup, and I never have to buy batteries for it.