I'm ready to buy a pre equiped tableaux de repartition for a surface area of 100+ m2. Firstly, am I correct in assuming that the area is the square metreage of all floors combined eg. 90 x 3 floors = 270 m2 ? My other question is to do with experiences, good or bad. I've looked at tableaux in Brico-Depot and there are 4 choices, all with same prefilled equipment but offered at alarmingly different preices, Nalto at 169 euros, Felten at 239, Siemens at 299 and Legrande at 399. They all apparently serve the same function. Has anyone any thoughts on this differential ? I know there is a vast difference in quality and price between a Lada and a Maserati but I would have thought that a tableaux is a tableaux. Any advice or experience of 'dodgy' makes would be much appreciated.