Diane was a backup sitter. I'm sure she's good but 1) I had requested for a evening timeslot, she showed up at other times of the day (eg 11 am). 2) the house has cameras and door sensors - I know when she came and left and it did not seem like she was there for 30mins.
I am very happy with Fetch. I love that we have the same person each time as it is much less stressful this way. Our sitter has built a relationship with the cats, and she knows their personalities and preferences. She also sends us pictures daily so that we know what is happening, and they are alright. Highly recommend Fetch!