It's very difficult to find a good decaf coffee in Canada. If it's tasty, it is usually processed with chemicals (Starbucks, Tim Hortons, etc.). If it's processed in a natural way (without chemicals), almost all brands use the Swiss Water Process. However, decaf made using this process isn't really tasty.
The only process that is natural and keeps the coffee tasting good is the CO₂ process, and almost no brands in North America use it because it's expensive.
Illy decaf uses the CO₂ process, and it has an excellent taste—like real caffeinated coffee. That's why this brand is my No. 1 choice.