Is it worth upgrading from a Titan X Maxwell SLI configuration to 1080 Ti SLI? There has been some mixed reviews online. What are the pros and cons for upgrading and why?

I don't play in 4K. I do play at 3440x1440p with the Titan X Maxwell SLI and Acer Predator X34 G-Sync 100Hz monitor which looks to be the sweet spot for gaming. What would be the advantage moving forward on with the 1080Ti?

IMO, yes I'll be going that route, myself. I've been GPU limited for some time now. Decided to skip the Pascal Titans as they are just awful cards for the asking price. The 1080 Ti is very well priced though. I'm hoping EVGA will release a Hydro Copper model and I will be picking up two of those and selling my Maxwell Titan HCs. :)

The advantage ?
 
The 1080 Ti will use less wattage
 
As a measure of RAW power I can tell you that Folding shows a difference between the Titan X (mine are SC cards with custom BIOS) and Titan X Pascal
 
EVGA Titan X SC - will produce about 800K PPD (points per day) --> this is about what an Air cooled EVGA 1080 FE is doing
 
Titan X Pascal - will produce about 1200K PPD --> 50% more
 
Folding proteins (folding at home project) is not gaming, not much of the graphics card's RAM gets used. 
 
However, the GPU is under 85-95 % load and the software is a magnitude less tolerant of an errors - games will play through errors, Folding will Not.
 
The actual build details are in my signature
 
Pascal GPUs are happiest when they are 50 C and cooler.  Boost 3.0 will slow the MHz as the card(s) warm
 
The questions I have:
Are you unhappy with your current build ? 
What are you trying to improve on your current build ? Just games or ?

Digital_Fuzion
Is it worth upgrading from a Titan X Maxwell SLI configuration to 1080 Ti SLI? What are the pros and cons for upgrading and why?

Yes.
 
Pros: More FPS.
 
Cons: Cost.

Is it worth upgrading from a Titan X Maxwell SLI configuration to 1080 Ti SLI? There has been some mixed reviews online. What are the pros and cons for upgrading and why?

 
Please don't take offense to my comment, but this pattern of sucking people into "new/old" GPU's its just ridicules.........Don't be fool, keep your Titans, keep them until at least next Titan's Gen or whatever they will bring in a few months and at that time you will be asking the same question and by than 1080Ti will be old news

I reviewed some feedback comments regarding  my 34" Acer Predator X34 IPS NVIDIA G-Sync Gaming Monitor with 100Hz. I have owned the Asus 27" G-Sync 144Hz monitor and could not tell the difference between 100Hz to 144Hz I will only consider upgrading to a better monitor that is HDR 144Hz 2K/4K with G-Sync ready and 34" to 35" wide curved viewing display. I like big monitors. The monitor should allow selective resolutions to get the best FPS and enjoyment out of the monitor.