Recently upgraded my pedalboard with the new Ditto X4 Looper from TC Electronics. I was using my trusty Boss RC-2 for years, but the following features on the Ditto X4 hooked me:
– two independent loop buffers that can be run simultaneously or serially;
– MIDI syncable;
– decay knob removes earlier layers to combat loop monotony;
– effects that are actually useful — half/double speed, buffer lock, fade out;
Still getting to know this new piece of kit, but so far I’m quite impressed. Will definitely make it easier to create the live soundscapes I’ve been focused on of late.  Here’s a quick video of some layered improvisation: