If you think Sprout sounds like a clique shoujo manga, you're most likely right. The good thing about Sprout is that, despite the unoriginality, the enjoyment of this manga is pretty high.
The story seems a little unrealistic and the art was adequate at best. The place where this manga shines is in the relationship between the characters. The complexity that goes on between the two couples is more in depth than other shoujo mangas. I felt there was enough comical characters to not weigh down the entire series with all the drama that goes on.
Overall I feel Sprout is a good read and I personally enjoyed it very much. I think you should definitely give it a try if you're a fan of shoujo.