Unfortunately I cannot say to many good things about the Wife-Swap Diaries. The character models are bad, the character personalities are bad, the music slightly annoying. The sound effects I found particularly annoying; loud, disgusting squishing that distracted from rather than enhanced the story. I guess the only decent thing was voice acting, and that was passable.
The story was pretty simple: two guys in sexless marriages decide they want each others' wives. They know one wife will be willing, but that the other will have to be raped into compliance. While one guy is with his swap target, the other is somewhere else watching a video feed of what is happening, thus getting off via voyeurism. The story eventually just descends into madness as one man struggles with guilt over the situation and the other keeps pushing boundaries further and further. As one man goes insane you are left at the end wondering what is real and what is fantasy.
Lets talk about the H content… I found it to be slow, emotionless, and not all that well done. The dialogue during sex sounds just like every other b-rated hentai, and I cannot say that anything about the H scenes stands out as special at all. I guess if you are looking for something generic, then this is fine, but honestly its not worth watching repeatedly at all.