Reading PDFs is no problem, I use `evince` since ~15 years and it does the job. I _very_ regularly have to sign documents though, and as OP said, nothing beats

Reading PDFs is no problem, I use `evince` since ~15 years and it does the job. I _very_ regularly have to sign documents though, and as OP said, nothing beats Adobe for that. I even pay the subscription so that I can have it on my phone, sign on the go, etc.