I don't know about the 600N but I have over 1000Hrs on the 520N and I tell you it's the best helicopter to do Long line slingning. The Notar system is also taking off presure of the pilot shoulders when your landing in dirty confined aerias fifty times a day. It is a lot safer. It is also ez to fly when you get used to it. Not to mention that it can be easely landed with an antitrust failure. But it does need a bit a maintenance.. . The questions you to answer first is where will you operate and what you want to do with it. <img border="0" title="" alt="[Roll Eyes]" src="rolleyes.gif" />