The One Control OC-10 is a great true-bypass looper. It can operate in two modes: Preset Modes, and Bypass Mode.
In Preset mode, the OC-10 has 70 presets available, allowing you to have more than enough presets for any gig. It also has MIDI capability, so you can control your MIDI enabled pedals (Eventide, Strymon, etc…). The OC-10 can even be made to function as an A/B/Y amp switcher, and it can do channel switching.
Bypass Mode: the OC-10 functions as any other true bypass looper. The switches on the pedal are 1 to 1 with each loop.
I really like the fact that the OC-10 has MIDI In. This allows me to send MIDI patch change information from my laptop to my pedalboard and change my guitar patches in time with the stems/loops that we are playing along with. My only wish is that it could communicate on multiple MIDI channels. As of now, it's only on MIDI channel 1. Workable, but does limit some advanced MIDI control.
Pros: Total control, 70 presets, easy to program, built in buffer (has buffered input AND unbuffered input), tuner mute, expandable (can be chained with more One Control products to create a larger looper), can be controlled by other MIDI capable units via 5 DIN MIDI or Cat5e.
Cons: MIDI channel 1 only, no tap-tempo.