Hello there and welcome to NAPM
I don't know anything about the agency I'm afraid.
I had a quick look through the website. There are quite a lot of things that strike me as efficient/professional (though a website can be misleading) but there are a few things that seem worth pointing out:
1. There is no filter for children's profiles, so anyone can look at them (many children's agencies insist on a secure log-in for casting directors etc).
2. The photographs look good, but they do appear to insist that you use their photographer and it isn't clear what this costs.
3. They say "
n addition we will be putting children forward for musical theatre productions and we will require your child to attend dance, drama and singing workshops.". I don't know what kind of commitment this is and what it costs. I find it a bit off-putting, unless it's an audition workshop. Do they run the workshops, or do they just insist that your child attends classes that you organise (either way, I don't much like the "require" element of it - what if your child is a brilliant actor but does not aspire to perform in/does not have the talent for musical theatre? Do you still have to shell out for dance and singing workshops?). Also, it obviously isn't good industry practice to submit children for musical theatre productions if they don't have the required skills - though they might not mean that they automatically submit every appropriately aged child (though this is how it reads).
4. I'm not sure whether they audition children, any good agent needs to know the skill level/personality/attitude of the person they represent.
5. As a new agency actively seeking submissions, they already have a lot of children signed up. As a "small boutique agency", just how many are they intending to sign up

?
6. They don't state their commission rate on the website so it's not possible to see whether this is reasonable.