Have never sat in this section but I am a Reds season ticket holder and I am always bouncing all over the ballpark. 139 has an obstructed view of the field thanks to the right field pole. It is nestled in the far right corner of the ballpark. Rows are lettered A thru W. Tickets are overpriced, I think they are generally $25 for this section.

Best thing about the section is it overlooks the visiting team's dugout. If you are visiting team fan, you will want to at least make a stop to this section. Outside of the section is a variety of concessions just down the steps. Awesome view of the Ohio River just outside of this section.
I would not recommend sitting here. Even the bleachers have just as good of a view and those tickets are $8.