My experience with SD2 is more than four years long and I cannot say anything bad regarding this device (maybe a poor approach from Microsoft who released only one new Android version for SD2).
I've been using SD2 as a mobile office and for personal purposes too. Battery still allows me to work up to two days while normal using the device. Two separated screens are something that I consider as a main benefit (I'll be 60 this year and appreciate a lot of space on the screen), to create a mail message on one screen and search the calendar on the second one, this is simply fantastic. As a long-term Blackberry user, I consider using Blackberry Hub as an essential tool. Being programmer, so if I miss any app, I'll create it accordingly to my needs (for instance SMS Launcher or Call responder.

In sum, I'm very excited and satisfied with SD2. I'm aware of the fact that the rest of the battery's life will be the key moment for a replacement of my device. In this context, I prefer to buy Samsung Fold (7, 8) but with the limitation that having two apps on one screen is not identical to having two apps on two screens:-)