@ Magicone,
My throughput performance is often not as good as the speed tests and has just dropped below 30 Mbps rarely. However I have never experienced sufficient drop in speeds to be of serious concern. It's a joy to be able to download enormous OS upgrades which previously were "cup-of-tea-time". I can't remember the last time I had any video buffering.
I've just used the SCC mapping facility and produced a road cable length, including a short loop-back that I know of, which gives a distance of 677 m. Allowing for the risers into the 5 cabinets en route I'd estimate my actual cable length to the cable modem at about 700 m.
Perhaps others here might have different experiences but, from my observations, the installations just work close to the maximum stated speeds. My main gripe is that VM are unable to extend their services if a new installation requires say a road crossing.
Kind regards,
Walter