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What's different
Hi Rong Yu,
"3Com isn't Cisco" is a good answer. VSS would be interesting even if Cisco were a tiny startup, but it potentially affects more users because of Cisco's large market share.
Also, XRN is a stacking technology. It does expand the capacity of multiple switches, like VSS.
Unlike VSS, the switches or routers attached to an XRN stack need to run spanning tree at L2 or VRRP at L3 if redundancy is a requirement. Both the L2 and L3 redundancy protocols are active/passive, so effectively you end up with 50 percent of your redundancy ports and bandwidth sitting idle.