As an airline with more than 100 offices in more than 80 countries, we have to find respectable law firms from all around the world from time to time to get legal assistance and the guide is an excellent resource to look for candidate law firms.
It is an objective and an impartial guide.
An international airline
We operate panels in many practice areas and in many countries. We don't always have a practice area specialist who knows firms in the country, so that is where guides like this come in handy.
The IFLR1000 is a useful cross reference to refer to ... to make sure a personal referral aligns with some objective rankings from a survey. I would refer to it in my main area, M&A, when looking for a counsel in a country we are new to.
The country-by-country tiered rankings by practice area are a good approach, to get a rough feel if a firm is viewed as active in a practice area.
UK General Counsel
US-listed multi-national corporate