David ,
I don't think the weight between the two is much different, and weights can be added to the cimex. and with vast array of diamond pads I,m pretty sure the cimex would hold its own
I have not used my cimex as yet for hard floors but I am considering giving it a go if I cannot source the right machine for hard floors.
Having said all of that I am bias, having had a r48 for the last 7 years , encapped 10000s of sq metres, reliable ,robust and never let me down apart from the rare blockage.
I shall be using it on 8,000 sq metres in the near future (hope fully if my quote is accepted) and I,m confident it wont let me down.
Geoff