It also depends how you use the octave pedal, as for me, i'd never consider using it on something as low as an open 'E'.
I'd like to try and OC-5, but having owned a few OC-2, my keeper track pretty damn well and sounds great, but I use it with dirt, often chorus, at least an octave above an open E. I don't use it to reach notes lower than the bass can produce, more to fatten up notes on the upper register, but others may vary i guess.