Add me in, Storm Trooper (White) Lumia 920.

So far the coverage still little compared to Google Map or Waze. Only Klang valley & Southern Johor is covered. Penang still doesn't have the traffic info.

Yup. Hoping one day the coverage expands to Penang.
One thing funny is that HERE Transit covers Rapid Penang routes (without schedules, even though bus ETA is available on Rapid Penang website) but not Klang valley bus services (Rapid KL or MetroBus).

HERE maps is available on Lumia devices and also Windows Phone 8 devices (integrated as part of the stock maps app), if I'm not mistaken.
HERE Drive+ has already integrated the traffic info.
Never actually tested the live traffic info, so cannot comment on the accuracy but a comparison with Google Maps might give u a rough idea.

For more info, maybe u can have a look at Nokia Conversation.

By the way, My Commute is not available in Malaysia yet.