Alvarez & Marsal Infrastructure Practice area, what they do, and the reputation

Per subject. A&M is famous for its R&T work. Recently noticed its global expansion in the Infrastructure and Capital Projects. Just curious what they do specifically. Insights and info beyond their website would be greatly appreciated. Curious if anyone has used them or worked with them before. Would love to hear more about the work they do with more details and also their reputations among clients.