I tried out their $20 for 10 days and attended many of the evening clases. By far, Jovita was my favourite. She would go around the room helping most with adjustments and articulating each posture. Most of the other classes seemed a bit slow paced. But since it's just a unlimited pass & 5 mins away from work, can't complain much :) you get 15% off if you renew with them before your pass expires.
As always, the studio is very clean. The receptionist is always friendly but when asked which class is the most challenging... they were not able to give me a straight answer. If you're looking for a little challenge (L2), go for Jovita. If you're a L1/L2 try out Katie and L1 try Julia. Classes for everyone.