I'm a fan of both the HW brushless and the silver can and here is why.
I run a silver can indoors on a short course windy type of track and it's perfect. If I tried using my HW indoors firstly I wouldn't get the power down and its a waste of time, silver can wins hands down.
Outdoors on a more open faster track and my silver can motor is a joke comparared to the consistancy of the HW brushless combo. Like people have mentioned before, the comparison with a HW and sports tuned motor is marginal but HW is slightly quicker. Can you compare the silver can to the above mentioned? no comparison period. HW and sports tuned win hands down.
Ok, invite everyone run the HW system as a standard and guess what? no more arguments , no more accusations on cheating and no more hovering around a commutator/brushes to see how its holding up! or better still no maintenance.
So shove the thing (HW) in you car and concentrate on your driving not the guy wizzing by with a suspicious motor
Racing mini's is all good here down under

Cheers
John