This review has a 601 (which I have) pushing M80s with no problems at all. BigJohn as the 701 and M60s with no problems as well.
I can only guestimate, but I think you would most likely be fine with the 801 and M80s. The one caveat here is that you want to ensure the 801 has plenty of airflow as they tend to run fairly warm. Mine has never been too hot to touch (I have the M22s, VP150, and QS8s), but it has gotten toasty after a few hours of Lord of the Rings and others like it.

james

"What can be asserted without evidence can also be dismissed without evidence." C Hitchens