The Windows Experience is still there--even in build 9860. However, the GUI was retired with Windows 8. If you want to run the experience, which is really called the "Windows System Assessment Tool," you must run it from the command line.
Open an administrative command prompt and type winsat formal -v -xml c:\winstatresults.xml. This will run the full formal test in verbose mode and provide an xml output of the results.
OUTPUT will be like below:
<SystemScore>5.9</SystemScore>
<MemoryScore>7.5</MemoryScore>
<CpuScore>7.5</CpuScore>
<CPUSubAggScore>7.7</CPUSubAggScore>
<VideoEncodeScore>7.3</VideoEncodeScore>
<GraphicsScore>6.5</GraphicsScore>
<Dx9SubScore>9.9</Dx9SubScore>
<Dx10SubScore>9.9</Dx10SubScore>
<GamingScore>9.9</GamingScore>
<StdDefPlaybackScore>TRUE</StdDefPlaybackScore>
<HighDefPlaybackScore>TRUE</HighDefPlaybackScore>
<DiskScore>5.9</DiskScore>