I've had my m70 for about a month now, and I love it. I go to LAN parties and do pretty high end gaming without any trouble. My class all have m70s, the sophmores have m60s, and everybody else is older (poor them). I can confidently say that I can double the performance of those m60s without trouble.
In comparing this to my previous Sager (a 3790), the Dell runs quieter and has slightly better battery life, plus I like the modular bay. I'm not much of a fan of Dell's touchpads, but having dual pointing devices makes up for it. I also get tech support here that will support me as long as I'm a Cadet, so I think I'll do some modding (not like I can void the warranty).