As the daughter of a yoga teacher, I have fairly high standards for yoga classes: Gilbert Yoga definitely meets them all!
I am not a big fan of 'gym' style classes where the practice is focused on yoga as a fitness exercise - I prefer it to be more spiritually focused and sincere. They run an honest, open and friendly place, with multiple levels of classes and workshops to meet many needs from beginners on. All the teachers that I have met so far have been kind, friendly, enthusiastic and accommodating. Don't be afraid to come by - it is not at all cliquey or exclusive.