I do not have experience with these particular consultants, but have reached out to multiple firms to find a consultant for applications this year. Many of them offer free consultation sessions, so this a good opportunity to understand if the fit/overall approach is right. Some firms have this consult call with an intake person, but it's important to speak with the advisor who you would be working with.
For me the important questions I had were whether we were aligned on strategy, typical turnaround time for materials, and personality fit. The application process is about digging deep and showcasing your most authentic self in a compelling way, so it's paramount that you feel comfortable and can be honest/open up. Maybe these points might resonate with you, maybe not, but my tip would be to think about what is important to you, then have many free consultations to determine the right fit.