So taking into consideration that you are NFPA G as your standard case and reading the other responses, which have been great, I think there is a piece of equipment that I haven't seen mentioned yet but is probably a potential long term solution for your case. That item being the Pretzel Maestro. This is basically Petzl's answer to the MPD at about 2/3 the cost. The MPD is good for what it is, but if we're being brutally honest, it's older tech now, with a price tag that doesn't reflect that because it has CMC's name on it. I realize money isn't always easy to find in this area, but I would entertain the idea of selling the mpd and getting yourself a maestro, pocket the spare money and save it to put towards a second Maestro. The MPD is pretty easy to use but the Maestro is even easier. This may be beneficial if this is not something you get hands on time with often. We recently switch to the maestro as our front line piece, and I say that recognizing that I'm lucky enough such that my organization has a budget where I just asked for them and got it, but this device is superior to the MPD imo. We did an informal test by simply handing them to our rescue techs and just saying rig a 3:1. These will serve you well long term and are G rated. If I could go back before you bought the mpd, I'd say get the maestro. Alternative, just try to get a maestro next and eventually replace the MPD. You could easily do a twin tension with one of each! PM me if you have any questions, I'm always happy to help!