My first Donair experience was in Barcelona, since then I've had a hard time finding donairs in Calgary that don't make me really sick... I don't remember my first experience at Donair grill but my Second has been amazing.
I got a regular sized beef donair with sweet sauce, tzatziki, and garlic, for veggies I got the works. This was amazing. I mean seriously I usually dread getting donairs in Calgary but this was the best one I've had since Barcelona.
The fries and gravy were something I wouldn't get again though, they were your average Mccains style Crinkle cut fries with subpar seasoning and the gravy was about the same... They could improve a lot on these with wedge cut fries and a house herb seasoning (like Opa fries and a higher quality, lighter, more liquid, less salty gravy or tzaztiki sauce on the side) which is why I dropped a star...
HOWEVER the donairs (which is really why you're going there anyways) are pretty darn good. I definitely recommend trying this place out. We went at noon and luckily they weren't busy...
I hope you enjoy yours as much as I enjoyed mine :)