SpectraCAL's C6 has the exact same hardware like any other version of i1Display Pro.
There are 3 version of the i1Display Pro instrument :
The standard X-Rite i1Display Pro (Retail, available at stores, sometimes SpectraCAL are selling retail meters also.)
OEM Generic version of the i1Display Pro (Version that LightIllusion, ChromaPure and sometimes SpectraCAL are selling.)
Custom OEM branded i1Display Pro (SpectraCAL of other Branded OEM's versions from HP, Toshiba, Eizo, Nec etc...)
From the features side, C6 is the only meter that is coming with NIST certification and equiped for a lot of EDR files for various display technologies, so it will perform better than the the OEM or retail but if you skip these tables and profile it using a spectro like a ColorMukni spectro or better one, you will have greater accurancy.
Ted's LightSpace CMS Calibration Disk Free Version for Free Calibration Software: LightSpace DPS + CalMAN ColorChecker
S/W: LightSpace CMS, SpaceMan ICC, SpaceMatch DCM, CalMAN 5, CalMAN RGB, ChromaPure, CalPC, ControlCAL
Meters: JETI Specbos 1211, Klein K-10A, i1PRO2, i1PRO, SpectraCAL C6, i1D3, C5