I have had a Mira Excel EV in my bathroom for a number of years. Have been 100% happy and I understand it is considered Mira's top valve, it is certainly the most expensive. We are about to have our bathroom completely revamped and want to go for a "rain" shower but remain with Mira. It means moving away from the Excel and probably going for the Mira Agile ERD. Two questions please. On the Screwfix page showing all the Mira Mixer showers it shows the flow rate per ltr/min and the Excel is the lowest at 5 ltr/min, with all the others averaging between 10 to 13 ltr/min. What am I missing here as that seems to make the Excel have the weakest flow? Second question, with the Agile at nearly half the price of the Excel, am I buying an inferior shower? The shower is fed by a Vaillant EcoTec Plus 831. Many thanks.