Discs work well, and though the show continues a trend towards darker themes - ahh, stop killing off favorite characters to get those grim 'surviving-characters-deal-with-the-aftermath episodes' ! Isn't ANYone allowed to be happy, or have even one not-aggravating parent*? - the teamwork, character interactions, plotting in both individual episodes and the overall arcs, acting, and writing is top notch.
*I mean, besides Abby, who as one of TV's most original characters of any gender, is delightful, and appears to be the one NCIS lead who by all accounts has great family relationships. Yay, Abby! :)