I believe Gaston Glock isn't as actively involved in the company as he was in the past. Everybody's gotta retire some day! I certainly have.
There have been reliability issues with the 9mm Gen 4s and even recent Gen 3 guns but I think that's quickly being resolved with new recoil spring assemblies. My 23Gen4 hasn't been a problem but not many problems have been reported in the 40S&W Gen 4s.
Anyway, $300 for a Gen 2 is a great deal! I've been very pleased with my police trade in 22 Gen 2.