I probably should go into the pluses and minuses about them. But just for public information I think I should at least give a brief rundown. Rabbi Aikiva Eiger. [There is a great full edition of everything he wrote in one big set.] The Ketzot Hachoshen and the Netivot Hamishpat both found in the big Shulchan Aruch. Rabbi Chaim Soloveitchik and his disciples (Baruch Ber and Shimon Shkopf). Also there is Naftali Troup. At least for reference every home needs these books in them. Because of the time factor I can't go into the ins and outs of how to go about learning these people. I am sure everyone is getting ready for Shabat. But at least I wrote the list for people that need to know what to look up in the achronim.
It is important to realize that these people define the continuation of classical Torah learning. But learning them is very different from learning the page of the Gemara you are on with the Tosphot. I would love to go into this but time is limited because of Shabat.
The first group of achronim are not usually concerned with the same issues that Tosphot is concerned with. Nonetheless they are important. The later ones beginning with Reb Chaim are getting back into the Tosphot itself.