I just finished this show. I definitely enjoyed it and would recommend it.
However there were some issues atleast in my opinion with the show. I see a lot of comparisons with A Love So Beautiful. While I agree with them, there is a lot different with this show as well. And if anyone goes into this show expecting it to be very similar, we'll you'll be surprised to say the least. While there are similarities, there are more difference between the shows. ALSB shows them go through school then college and the final episodes focus on life after. With You is mainly set in High School, the final 2 episodes focus on life after, there is no progression to College and the experience there, the ending of the show felt very rushed and I'm generally not a big fan of open Endings so that also annoyed me.
Second Lead Syndrome will happen without a doubt in this show.
As a romantic, there isn't really much in terms of romance, like you as the audience know the main characters like each other, but they don't kiss until the final episode and even then its an emotional scene and well it left a lot to be desired.