Well the BS36 isn't that far off from the X5 "big" model - 36cm working width versus 37cm on the domestic X5.
The thing is, for the moment, the BS series, regardless of whether it is a commercial model, is the only SEBO brand from UK arm of where manual height adjustment is available. The Dart models don't count when they only have a 3.5 litre dust bag on board. Its a real shame SEBO don't have the G1/G2 series to buy; they replaced it with the Dart, whilst it is good, it is not the same as, IMHO.