I have gone to Diner Deluxe a number of times, and it is definitely a must-visit when driving through Edmonton Trail in Calgary. It is often busy, which goes to show that it is a popular spot in the city.
I had the Pulled Pork Hash which was quite good. The caramelized apples and onions, adds the right amount of sweetness to the hash and would definitely have it again. The addition of Philip & Sebastian's is great, as the Diner has partnered with a local coffee shop.
The atmosphere was great, as it really harkens back to what you would expect a Diner back in the day would look like. I even enjoyed the mugs that the coffee came in, as if they just came out of Mom's cupboard.
Be prepared to pay a bit more for locally supplied food though. Sadly, it's common to pay a higher price for locally supplied food, but it's good for the local economy! It does get busy and wait times can be more than a half an hour, check out the little bakery beside it though while you wait.
As a bonus, Diner Deluxe was one of the locations of the movie "Holiday in Handcuffs" starring Mario Lopez (AC Slater from Saved by the Bell) and Melissa Joan Hart (Sabrina the Teenage Witch). How can you go wrong?! Haha.