Hi Paul,
Welcome aboard, and may I say what excellent taste in floorcare you have!
I actually think the large capacity works in Numatic's favour. A friend of mine swaped her Miele S5 for a Henry as the bags were filling up too quickly and costing a lot to buy.
However, a compact model sold alongside would be a good idea, to give the buyer the option. But then again, Numatic seem to take more of a no-nonsense "less is more" approach to their vacs.
Chris