The Atlas is the only bad big berghaus bergan, it has a bad rep due to it's military use and the complaints it received then when it was given as a replacement for the Crusaders or Vulcan II, it became a laughing stock due to dodgy straps and weaker construction, if you look around online and read the reviews and comments it is always military folks giving the bad reviews saying to fellow squaddies that they should stick with their old Crusaders or get a new Crusaders.
I have only ever had the Crusader 90+20 (with the side pockets) and find it all the rucksack i've ever needed, 90% of the time i use it without the side pockets attached and carry them separately zipped together as it makes getting on and off or in and out of public transport much easier with the width reduction, once in the wild if i am moving camp i zip them on unless going through thick brush then again i remove them as it keeps snagging up, only slight gripe but it's no prob as they are on and off in seconds compared to my Highlander 100l which has permanently attached side pockets and constant girth problems, last thing i need is more girth.
I paid £55 for mine inc postage, ex issue item in perfect condition even had the axe loops still attached to the molle straps, all in highly recommended here, only real difference i can see between the Crusader and Vulcan is the Crusader is a bit bigger by 10ltr and the Vulcan has no molle attachment points whereas the Crusader is covered in them.