A really fun show that had some great guest stars, IMO did a lot for STEM, and probably the show that most promoted sci-fi products without being sci-fi. The final show IMO lived up to what it established through the whole 12 years, and it was also great in the final season to see most of the surviving recurring characters return for a final cameo. The whole scene on the plane where they were grouping up to talk was great, and a LOT of call backs to bits through the years with the baby, elevator, thermostat/hoodies, apartment decor, and other long running jokes.
I also watched their later special, and it was neat to hear how Stephen Hawking reacted to the impersonation and the punchlines he was involved in.
I also think the Young Sheldon episode had a great tie in where we got to see each of the seven as their younger selves.
It was a great 'quirky' show that will absolutely live on in re-runs.