Never heard of them. There aren't many red flags, but take it with a grain of salt:
- They say they have tons of well-respected clients, but I haven't heard of anyone on their list.
- They say all writers need professional editors. This might be true, but you don't need to pay for a professional editor if you're going the trade route. You'll be assigned one. In fact, if you're going the trade route, getting a professional edit first can signal that you don't know how to edit yourself and can turn off potential agents. It can also signal that you're not going to want to make changes because you've already paid for a professional edit and thus believe that you're done and ready to go.
- There's no list of prices anywhere on their site. This is a red flag for me because that's the second question I'd ask any editor (the first being what their qualifications are). This suggests to me that they overcharge.
- Their FAQ is empty.
But, hey, if you're self-pubbing, read through their sample edits and see if they give what you'd want.