It's pretty good! I've had the chicken souvlaki gyros a number of times, and it has always been really delicious. I was a bit put-off by the idea of having french fries in a pita at first, but I have learned to stop worrying and love it instead.
The tzatziki is very tasty here! And I like the general ambience of the place, it's a very good spot for a quick lunch or dinner break if you're working in the area.