Agreed. Prior to me porting out to Rogers, Freedom still had their coverage issues. That isn't going away anytime soon. But note that LTE was just released 9 months ago. If you were with Wind/Freedom before that, then its a given that you received no where close to those speeds because LTE didn't exist on their network.
But now that LTE is in place, those speeds are possible, but as you mentioned, one is still likely to be plagued by coverage issues.
If you go out of town (with no Freedom coverage), you'd connect to a roaming partner (Rogers or Telus) which obviously has good coverage.