I used them last year, OP, and my dog was absolutely A-OK.
Same situation as you pretty much - parents usually have her, but they were coming on holiday with us, booked at relatively short notice, and so we needed a solution.
We had a long chat with the chap who collects the dogs, returns them and is on call for queries whilst you are away for both you and the boarder.
He showed me lots of profiles of boarders on their lists, along with their dog experience - we explained we wanted her as an only dog, as that's what she's used to - and they matched us perfectly. They had a lot of retiree couples who don't want a dog fulltime anymore but have loads of experience.
When she went it was for just about 10 days and we got send a few photos by text, a diary from them when returned, and the Barking Mad guy contacted us with a tiny query about a mark on her underarm via the boarders on Day 2.
She's going back for a long weekend this March. Different couple, as the original boarders have recently got a puppy and we decided in consultation with Barking Mad that it probably wouldn't be a good idea. I have the details of who she'll be staying with - not the address, but a profile of them, whereabouts they live, photos of their house and garden.
I suspect it depends on your franchise. Ours I would recommend 100%.
My DC were particularly worried, and so they really did look after us by sending photos specifically for the DC to show her all tucked up with her teddy at bedtime!
Charges are a bit steeper than other options locally but I like the ability to specify she'll be a single dog which is often not the case with other boarders.