I still use my fat ps3 for ps vue viewing..but boy is that thing slow.
Anything regarding social networking on the PS3 is essentially a huge beta. PlaystationStore, PS+, and the failed PS Home are all buggy and slow; but it is free; which was one of the factors that made me buy one lol.
I mainly use the fat PS3 as a streaming box for Netflix/Hulu/etc. and maybe some games that wouldn't make the jump to the PS4.
The differences between the pro and original are subtle but I've come to enjoy them .
There's already a difference by switching out the standard PS4 HDD for an SSD; and frankly that's fine with me. I'll start trying to get a Pro some time later on again, but until I see a fps upgrade on the Pro, I'll stick to saving up for the Switch.