1. Did the program work for you? Did it increase your max significantly?
You can program to increase your max in easier ways, especially considering I was Olympic Lifting at the time. I tried it for shit and giggles. My max actually decreased secondary to too much workload since I was Clean and jerking and snatching 4x per week.
2. Did the strength gains last beyond the program?
Not really much to measure but in short, no.
3. What kind of routine did you do following the Russian Squat routine?
I was Oly lifting so back to my Clean/Jerk plus snatches 4-5x per week.
I thought about running it again but I prefer slow strength progress at easier workloads over a program that "promises" a greater increase in strength with a shorter window to achieve it but provides a workload that is hard to manage physically. More power to you if it works but be smart and back off at any signs of trouble.
Lewdog's record in Royals game threads: 22-12.