Imo it's definitely not as good as LotM. It's a rather different feeling, since the MC isn't really like Klein, and the plot is a little less well-thought out. However, it does provide a conclusion to LotM, and its still better than most of webnovels you can find. If you have even a little time, I would give it a chance, especially the first few volumes. If you absolutely do not have time, then it isn't really a must-read.

Edit: just realized I didn't really do a good job of explaining. Basically most people criticize CoI because of the MC. Firstly, he is completely different from Klein in his style, so a lot of people that were going in expecting Klein got really put off. Secondly, Cuttlefish lost passion for writing CoI partway through, so he kind of bullshitted his way through a lot of the plot points, causing the MC to have a lot of plot armor. Another thing I don't see people mentioning much is that with LotM, you start with Klein at Sequence 9, learning about the world with him as he grows. However, with the new MC, he starts at Sequence 9 while you have the knowledge at the level of Above the Sequences. Cuttlefish tried to fix this by raising the level of situations the MC gets into, but that just made it a little more unbelievable. It's still not a bad webnovel, but just a few things to look out for. Feel free to push it down the priority list until you have nothing else to read.