You can check out this list for the included content.

Poser isn't a subscription. It does check your serial number so you do need to connect to the internet once in a while. I think it's every three weeks, but could be wrong. If you have unreliable internet or anticipate connection issues, you can contact support and see if they'll work with you.

Render times can be high depending on your scene, which render engine you use, your render settings, and if you use GPU or CPU renders. It sounds like you're in the same boat as me and don't have much choice on GPU vs. CPU. I usually render overnight.

With DSON not being available anymore, you may have trouble using Genesis content. I do believe some have had success exporting from Daz Studio as an FBX and importing that into Poser.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10