Question is mostly for Purp since I know he uses Irritrol. Your evaluation and preference between series 100, 200, and 700. All these models accept the onmi-reg. I have used the 200 & 700 series, however not with the omni-reg. One thing I don't like about the 700 series is the lack of an external bleed. As far as performance, haven't had any major problems with either of those models, or for that matter any Irritrol valve that I have used.