It can smell a little bad for a few days after getting the mud up - but, it is nice to work with, and the dust is low when sanding (compared to other products out there).
What’s a “Flowmaster?”
Yes it is very easy to work with.
Very long dry time compaired to conventional
Not really. I would use 45 or 90 minute easy sand in a bag.
You may need to add a little water and mix well. It should go through just fine.
Yes, very similar in application and sanding to regular joint compound
Yes. I use the fiberglass tape on bigger gaps and the mud holds up great, no cracking.