I ran a V-Twin with my Triple when I had it, as well with my ROV and T-verbs.
It gave me an extra couple channels ..... I didn't set the v-twin for a whole lot of gain, usually ran it at 50%. If I used it on the clean channle I had; Clean, low gain and a low med gain, when I used it in conjunction with my Recto's distortion I could have a lower gain setting on the recto and use the v-twin as a "more gain" boost to give various stages of distortion. Out of my 3 channel Triple recto when combined with my v-twin I could get a total of 7-8 different tones at my command in a foot step. I think it's well worth the money and is a great pedal to use with an all clean amp for practice too.