Yes, RackShack uses Cognet for the 10mbps unmetered servers. Since my box is metered, it uses their other Tier 1 providers, not Cognet.
As far as staffing their datacenter have a look:
http://www.rackshack.net/english/aboutus/staff.asp
And not having much invested:
http://www.rackshack.net/english/col...nstruction.asp
RackShack may be a reseller but their parent company is ev1.net which is Tier 1.
I am simply stating that in the time I have used them, I have been very happy with the service and support.