I think its the other way round ,people who buys the r10 whishes' they had a HW100 .I had a r10 MK2 vc sold it hated it ,Not any were near good as HW 100k in every single way .
The T10 is a good gun if its regged and the ultra is even better that's my opinion any way
I had a 100 and wish I got the r10 instead, I think the feel better to shoulder and shot a lot better IMO