The short answer: I haven't travelled much in Canada yet, but I've already used Chargepoint, Blink, and addENERGIE in Victoria and the US, and it was much more convenient (and cheaper) being a member.
Longer answer: I went slightly overkill to make sure I was never caught without a way to charge in the US or Canada. Browsing Plugshare, once you're off the TransCanada there are plenty of non-Sun Country, and there are lots and lots that don't identify what charger they actually are. So I ended up getting:
- Chargepoint (2 free cards for a $25 deposit against future charging), and I've already used three chargers in malls and one in Vancouver's Granville Island
- Blink (besides other places, used twice at NBA basketball games, the charging spots were right by the entrance door, way closer than I could have gotten otherwise)
- SemaCharge (just received the card in the mail yesterday so haven't used them yet)
- addENERGIE, $10 for their card, a Quebec company who have free-to-use chargers in all the rec centers and parkades around here, I use them at movies etc, and there are a whole bunch in small towns across BC (must have been a coordinated municipal government push)
- Greenlots, signed up but they don't use a card, just the charging station number against their app, and I haven't seen a charger yet
- AeroVironment (OR and WA mainly, free until April when their $ infrastructure gets going)
Now if I can just keep all the cards straight...