Note: I read the de-censored version, which has absolutely stellar art. I do not recommend reading the censored version at all!
What impressed me most about this manga is how non-standard their sex is. There is amazing variety in the positions: the characters hug each other during sex, kiss in wildly different ways, there is analingus, ball-sucking, and even a girl touching herself WHILE getting boned from behind to try and get a clitoral orgasm in along with the vaginal one. The only other author that comes to mind with this level of variety in sex is Akatsuki Myuuto, of Shoujo x Shoujo x Shoujo
Art: The girls are very realistic. They don't have perfect, idealized bodies; some of them have little deposits of fat and such, which makes the whole thing a lot more believeable. Girl body types are very diverse, there is something for everyone here. Overall drawing quality is superb.
Story: Very meh, because even though the entire class went on the trip, no male student manages to get a single erection despite all the exciting things to see around them, EXCEPT for the one class rep who gets a massive, incurable boner. The teacher set up a "boner relief" tent for him, and now every single girl in the class wants to try and "relieve" him of his problem.
What wasted potential for gangbangs and variety in the male type. The rep is the only one who gets lucky in the entire 255-page manga, except for the very end, but then it ends abruptly.
Character: Girl personalities vary wildly, so there's also something for everyone here.
Overall it was well worth the time spent.