I own Heat on Blu-Ray. Great movie. Love the diner scene with DeNiro and Pacino. Also love the fact they shot it live using two cameras instead of doing it the hack way they usually shoot those types of scenes - one guy recites all of his lines, then the other guy does all his, and then they cut and paste them together.
Mann wanted to catch the vibe of them talking in real time.
Watched this last night on Netflix. I'm a huge Ebert fan and it's terrible what the guy went through his last few years. To see how positive and funny he remained right up till the end was pretty amazing. Also really insightful seeing the complete story of the very unique relationship he and Siskel had. Total love / hate.
Anyway, this is really, really well made and doesn't pull any punches at all.