It was apparent with NGS too, who were (are) one of the most highly regarded pen testing companies here in the UK. Having worked with many of the leading ones I can say NGS was always at the top of the list, helped not only by their talent but also small size which made them flexible and adaptable. After the acquisition I noticed this changed and a number of the guys I'd worked with left. So it is probably good that Matasano is staying Matasano but with the ability to draw on the collective resources of all the other teams.
I wouldn't say that NGS were the most highly regarded by anyone but themselves. They had a lot of technical expertise in various areas but terrible account and product lifecycle management. Still, there were some extremely smart people there (and I'm sure there still are, you just don't hear from them as NGS).
