I have Some AGNC and NLY and now that I have learned some about CIM, I am thinking of adding picking up some. All of these high dividend paying stocks will either eventually go up or back down on the dividends, so I think they are short term holds but ride them while the ride is good. By the way, I have always believed that generally three or less letter symbols are stocks on the NYSE and four letter and more symbols are on NASDAQ.
Honestly, AGNC looks pretty good at a glance. The only thing I don't see with AGNC is insider buying. I'd also note that CIM has already recovered from the dip it took after earnings were released while AGNC appears to be where CIM was a week or two ago.
I'd have to do some more research on AGNC but heck, now that you've brought it up, I'll have to consider putting a few k in it.