Hi Pestie . . . . age, unknown, I've had it since at least 2010 and I got it from cash converters, but it's in pretty good nick. It's hard to say how easy something is to use.
You essentially have 50 programs each with a part a and a part b. For each program and part you can pre set a key signature and define two harmonies to be added to that part. It also has three different reverbs, although ~I can't remember whether they are programmable.
If you want to use it live, you will need to find a footswitch that works with it . . . trial and error I'm afraid. I used the behringer footswitch that comes with their v-amp pedal, or maybe the original footswitch is still available from Digitech. So you program it all up, set the program before you start the song, then when you want the harmony you hit the footswitch. You need too have set the program to the key signature the song is in.
If you're using it for recording you probably don't need the footswitch. I found it pretty easy to use and I'm an old git with only five o levels ;-)
Colin