Haven't done across Canada (hopefully next summer). Across Ontario from the southwest to the northwest, made the 1300km trek this past weekend. Used CCS chargers where possible, as others have mentioned they're hit or miss in terms of reliability and cost. Definitely can be huge savings over Supercharging.
I'll give my specific experience below, but like was mentioned it's always great to have reliable supercharger near by as an alternate. Still new to all this, 3 week old M3 RWD
. Total spent was $46 vs. $150ish with hybrid Lexus CT earlier this summer. Supercharging is the way to go if you're in a time crunch, but if you aren't in a rush and want to save money CCS can be great. Really feel bad for non-Tesla EVs, I don't think I could handle the anxiety not having the Tesla charging network as a backup.
Flo CCS (Dufferin County) 50 kw - $5/hr - steady 45kw, gained 22.8 kWh for $2.53 (11c/kWh)
SWTCH (Parry Sound) 50 kw - FREE! - stayed here and charged to almost 100% - 45kw til about 90% then tapered down, gained 55 kWh, $0
Petro (Sudbury) 200 kw - 33c/min - disappointingly slow at 41 kw, only charged for 18 mins and never went above this, gained 12 kWh for $5.69 (47c/kWh)
Supercharger (Blind River) 250 kw - super easy/fast - peaked at about 113 kw, gained 14kWh for $7.35 (53c/kWh!!)
Petro (Sault Ste. Marie) 200 kw - 33c/min - pulled 127 kw here (14% SOC) and maintained above 100 until 70%, gained 39 kwh for $8.39 (22c/kwh)
Petro (Wawa) 200 kw - 33c/min - station #2 wouldn't even recognize the car, chatted with a Porche Taycan connected to #1 and he spent half an hour trying to get it work with tech support (useless), finally got #1 to work, but almost got stranded here. Petro + Tesla are the only DC chargers in town and it's over 200km Wawa to the Soo. 0 gained
Supercharger (Wawa) 250 kw - 22% SOC, only did a quick 5min top up here but if I remember right it was pulling 137 kw.
IVY (White River) 50 kw - 30c/min - steady 45 kw, wanted a bit longer break here so opted for slower IVY vs. supercharge, gained 38 kWh for $17.16 (45c/kWh)