I got a Vox Lil Looper for Christmas - thank to Mrs F as ever. I've only had one session with it but great fun so far. I like that it has effects on the unit and that you can therefore get a bass sound from a guitar as it has an octaver type effect. I've built up some chords and bass with which I can then solo over the top of. Great fun.
Not sure I'll incorporate it ever into live performances but will be using it at home definitely.