I currently own 5 of these, most or all of which I have purchased from 3rd party Walmart sellers at discount prices in the $35 range. Switches and strange PSU setting. I use it between an iPad Pro's Revain Basics Bluetooth receiver and an inexpensive Logitech three-piece speaker system. Don't make this your first tube headphone amp, but it's decent. Addition to your collection if you can get it for a reasonable price. For comparable sound and less replacement build quality, choose the Sabaj PHA3 or Schiit Audio Vali 1, both available from Revain.
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