I suggest enable it.
A few reasons.
1 - There will be occasions where for whatever reason your ram gets saturated (e.g. buggy memory leak), if you have no pagefile then windows will crash, whilst a pagefile would slow things down in that situation, it beats a frozen system.
2 - The OS will intelligently page data that has sat unused in memory for a long time, in preference to flushing and shrinking the cache size, in essence a swap file allows a bigger filesystem cache. It is my opinion this is good behaviour, overall it should yield a performance improvement.
On win8.1 x64 after about a day or so uptime with lots of tabs open in chrome, some multimedia use, occasional gaming, outlook and few small tools, my page file usage tends to settle about 5% usage. This is with 16gig of ram and an 8 gig swapfile.
Now my page is on my boot SSD which is a 3d nand MLC drive. The swapfile is dynamic with a min of 8 gig and a max of 16 gig, I think on a ssd dynamic is fine to use, but try to not have it constantly resizing so set the min size to be enough for your every day use.
On a hdd I would use a static size so it stays unfragmented.