Iv'e got both, yes the XR1100 is lighter, so light it blew off a wooden table onto grass, luckly no damage.
well i got a xr1000 in the post yesterday- was meant to be new but when i got it it was quite the opposite! and i still feel sick from the fags smell in the lid!! anyway seller agreed to refund - so have to spend £11 to get it shipped back! The XR1000 felt lighter then my Rx7... Think i will keep an eye out for a XR1100
In this situation I demand refund for post both ways as its not your fault. I haven't lost a dispute this way yet