I walk by the place daily and have popped in a number of times for various items. I'll start by saying that I really wanted to love this place and have it be my go-to Bakery, but I really don't get what all the fuss is.
I've had a croissant (it wasn't very crispy or buttery), their version of chicken pot pie which has scone-type discs in place of pie crust (it was lacking in flavour), a loaf of bread (it ended up having mould/a fungus in it. It was allegedly baked that morning so I was really quite surprised). To their credit, when I went back to the store to tell them, the quickly remedied the situation with another loaf.
We ordered a vanilla birthday cake with strawberries and it was so very disappointing. Dry, scant on frosting between the layers and with just a few strawberries on top (so much for it being a strawberry-vanilla cake!)
It could be that I just have bad luck, but given the variety of products I've had, I think it points to Mabel's (or at least the Roncy location) being lacklustre and low quality. I recommend you try another spot.