How long is long?
tl/dr the Vox may be worth a flyer for cheap.
I just got a Vox Dynamic Looper for $64 that is as deep as it is huge. But you can really do a lot with it. Pre-fx are a bit naff, mostly, but the verbs are serviceable vanilla and the delays sound like Delaylab algos, so not bad at all. The Spacestation-ish synth swell is fun, and the dubby synth bass ain't half bad (smarter to leave the filter squelch alone so good onya Korg/Vox).
Lot's of flex in loop creation--defeatable metro gnome, selectable loop quantization, etc., etc.
Every single stinking demo out there fails.
Major limitation (aside from sheer mahoose-ivity) is loop time. In this day and age, 90 seconds total b/w 2 loops ain't much, perhaps. It gets me over the 28 second DL4 hump that killed my dreams of looping out during the old band's longest breakdown (a cycle of 4 approximately 32 second passages building in intensity), but it's not enough to cover everything in the newer more ambienter project.
Still worth it all because the loop effects are killer--far beyond the Ditto X4 I had to sell to pay for med bills. Think more like the loop effects in the Tine Factor/H9.
Mahoosiveness slightly mitigated by included expression pedal for slow loop scrubs and other tricksiness.
And yes, the pitch effects do suck as bad as they sound, so that could definitely kill the appeal for many. But the double speed octave up loop card can only be played so many times in a night before getting back-of-the-fridge-herring old. For me the shelf date on that trick has now sunk to none, so I'll be ok without.
Addendum:
Too long post already, but, should add, the killer app is the re-sampling function--so you can make yer loop, chop it all to fuqq with the post loop fx, and print that by re-sampling it and let the chopped version run while you knob twiddle/tune/beerswig/merch out; whatever it is you're doing between songs. Or don't print it--let the unadorned loop run and waggle the pedal each time you complete a stage lap. Choice is good.
But don't listen to me; I like being that weird kid from the island of misfit toys with all the uncool gears. 
"In a moment of unparalleled genius, Noel Parachute headed off this potential disaster by unplugging the microphone."