I frankly don't know of any reason that you should definitely own this stock nor do I know of any reason that you should avoid it. If you're looking for a reasonably safe place to put some bucks away and are happy with a yield in the mid to high 5% area then buy some. Be aware that it's thinly traded so, if you buy, you should be thinking buy and hold and not expecting to trade it. You can't play dividend capture games with this one, not because it doesn't cover the divvie pretty quickly after ex-day, but because you can't cover the bid / ask spread.
Also look at PMID which is similar although PMIDs divvies have been qualifying as return of capital so you don't pay any taxes on them at all but instead use them to reduce the basis of your holdings. PMID is also thinly traded and is only good for a buy and hold approach.
I have held ARMF for better than 2 years, and have been very pleased. Only a small portion of my portfolio, but those dividends help my overall average out. If you have a portfolio of say 200K, then maybe buy about 10K in ARMF. . .5%. . .this isn't Chevron, but a nice solid company.