The important take-away here is that the basic loop functions on the 'Rang III are just as comprehensive and straight-forward as they are on any other well-designed looper.
I just find it funny when people say “but you need a SideCar”, when that’s simply not true. The SideCar gives access to functions that most other loopers don’t even have, never mind offer in a convenient implementation.
If you want to do advanced looping: i.e. complex song structures, polymetric phrases, punch-ins, copy and paste on-the-fly, loops of different lengths playing synced and free at the same time in different play-styles, with different loop FX applied independently to each loop, etc. … The 'Rang III can do that. All while MIDI synced (or not), with loop quantize engaged (or not). And in these situations, yes, the SideCar can help (but remains optional nevertheless).
Make no mistake though, the 'Rang III can function as a basic looper just the same—better than most, in fact—with or without the SideCar.
To that end, I do have a SideCar, but I gig without it; choosing instead to use the space on my pedalboard for two 'Rang’s. I don’t miss it (the SideCar), but it would be fun to have, if I could incorporate it into the rig without sprawling beyond the reasonable boundaries I’ve set.
Cheers!
P.S. Sorry for all the edits — just trying to word things right, as to not mislead anyone.