This place certainly has a different vibe than the original Danforth Messini's - no congregation of the Greek masses at 2am but rather the working types grabbing a bite and similarly looking for a new alternative to the unappealing Eglinton Centre food court. Lots of places to sit, and it is always very clean.
Prices are comparable to other lunch spots - from $8-9 for a pita or skewer with a side of your choice (potatoes, salad or fries) and a fountain drink/bottled Ioli water. The Greek salad is pretty good although portions are less than the potatoes (which are very plain). Both chicken and pork skewers are good.
Tzatziki doesn't have enough kick (ahem, where's my mandatory gnarly garlic-breath?) and I think they must use less-expensive sour-cream in the place of heavier yogurt.
For the mid-town types who aren't fresh on their Greek, remember Gyro ('Yee-row') is pronounced like "Hero!"