Amazon has reviews and other sites have similar info.
Amazon.com: Quell Wearable Pain Relief Starter Kit: Amazon Launchpad

[The starter kit costs about $250 and comes with two electrodes, enough for a month’s use. After that, you’ll spend $30 a month to replace the electrodes. The device isn’t covered by insurance, but is reimbursable through a flexible spending account.]
Quell Might Reduce Chronic Pain Without Drugs - Consumer Reports

NeuroMetrix Quell: What Did People with Chronic Neuropathy Pain Say About the New Pain Relief Device? | diaTribe

There are a few posts mentioning it here on NT also. Here is one..
Quel as a treatement for SFN?


If you decide to test it , be sure to buy from a place with easy returns just tin case it doesn't work for you..