As far as I know, Telus and Bell customers won't be able to use the HD2 in central Canada due to the fact their 3G+ networks aren't yet present there -- only in the east and the west.
As a Telus customer owning a T9193 and living in the west, I can say that the phone is superlative. I've had some niggles since getting the phone in January, but these were mostly minor. The two biggest ones were:
- Rotation not working (fixed, it was because the flashlight app (which doesn't support landscape) was running in the background)
- Phone dialer keypad sometimes disappearing (setting phone app to rotate, rotating and then unrotating fixes this)
- Outlook Mobile sometimes freezes when sending SMSes, have to open Task Manager and kill it (since flashing latest EnergyROM I haven't experienced this)
Currently I have the phone in what I would consider the perfect configuration. I'm running the latest EnergyROM (which is absolutely stellar...I love the fact that default HTC messaging is removed and that the Outlook Mobile-based replacement has MMS support) and I can honestly say that I have no complaints...it's rock solid -- finally 100% happy with my phone.
As for networks, I can confirm the phone working on all 3. I've used my supervisor's Roger's SIM to test Roger's, used my roommate's Bell SIM to test Bell, and my own SIM and extensive use to test Telus.
Like I said, in central Canada I don't think the HD2 (being solely GSM and UMTS) will work on Bell or Telus (since they're just CDMA there), but other than that all 3 should be a solid choice, although personally I recommend Roger's -- they have better coverage in my area (I lose Telus signal in the data center where I work, but Roger's coverage with my supervisor's SIM in my phone remains strong).