tc electronic Mimiq Doubler

Indeed.
My uses:

Dry & wet stereo (mono in, stereo out):
It is like the BOSS chorus way of doing, but without hearing the sine wave of the chorus.
Using it with 2 amps. Left gets dry and right gets wet signal (both volume knobs on max.). This is the default when setting "DUBS" to 1.
Alternative you can use it only in the right channel and set the "DRY" to minimum.

Stereo double tracking (mono in, stereo out):
Use 2 amps and set "DUBS" to 2.
Turn the "EFFECT" knob up till you get a nice doubling (for me around 3 o'clock). The left and right doubles are different and thus you create stereo.

Mono double tracking (mono in and out):
Use 3 "DUBS". Set "TIGHTNESS" on max.. And turn "EFFECT" up till nice double tracking (above 3 o'clock is probably way too much).

Till now all after drive.

Push a drive (mono in and out):
In front of drive.
Play around with all knobs, but keep "DRY" on max.. The more "DUBS" and/or "EFFECT", the higher setting of "TIGHTNESS" is needed.
Feels like as pushing a drive with a chorus, but without the warble.