This LN is one of the case that apply to it "don't judge the book by it's cover" but in this case "by it's title". Reborn as a Vending Machine may sound generic or another Isekai troop but it's not. the most thing that i loved about this LN is the character, each one is quite unique and memorable (and by memorable i mean not the type of charachter that after you read one volume you completely forget about them) and the most unique charachter is the Vending Machine "Boxxo", he is not your usual OP MC, but the way he use his Vending Machine funtion to solve various problem: whether in fighting or daily life problem and that's really the real Joy of the book. There is also Lammis, which is gifted with a really strong body (she is the only one that can lift Boxxo) and the relation between her and Boxxo it's quite adorable, not quite a romance relation but the way each one take care of the orther and protect the other is really beautiful. the other charachter i believe it's better to read and discover them by yourself (i may find myself spoiling). Why i did give 7.5 to the story despite it being good and despite the story building a good dungeon mecanic and a good world to be more discovered, but a lot of premises went without being further discussed of reached: one of them the potentiel ability for Boxxo to become human again but in the same time his dilemma for not being useful like he was in his previous life. the third volume ended fairly good in a way that can conclude a part of the story and give you an insight of what can happen next and in the same time leaving a room for volume 4 which can expand more into the premises (which if we luckilly get a continuation those premises will be further discussed according to the WN which already ended).
So overall for 3 Volume you will get comedy, adventure, fantasy, monster fighting, a little bit af slice of life in the beginning of each volume and a cute fluffy relation. I think that's a good deal for 3 volume, i highly recommend it for anyone. Give volume 1 a try and you will definitly seek more