I'd put it into three categories and all of them are positive...
"Huge money and getting huge money level play." That's Milton Williams. He's playing like one of those transformational free agent additions where you pay top dollar and actually get what you paid for and it helps jump start your turnaround.
"Solid starter level player that's more expensive than you like for what they are but that's life when you have to sign starters in free agency". I put Landry, Spillane, Davis, Moses, Bradbury in this category. Ideally you don't need to pay FA addition prices for these kind of starters, but we were in the situation that we needed to and they've delivered.
I have Diggs somewhere between #1 and #2. He's playing really well but still only half the snaps. He's a lot of money for someone who's lower tier #1 for what he is so not the first category but better than the 2nd still. Overall, very good signing.
"Low cost signings that you nailed the evaluation on and getting great value." Chaisson and Tonga for this gorup, as they've been awesome in their roles.
"Low cost signings that you're getting solid enough for what you paid for." Dobbs and Hollins here.