Well, it's early days but it's been running almost constantly since it arrived and I've got a ton of new models to paint now.
It comes with a really good build plate that PLA sticks to like glue. I found it stuck too well and stuff was actually difficult to remove so I installed a glass bed which, with a spray of 3DLAC sticks everything when it's warm and releases them when it cools (5 mins and a re levelling of the bed to fit it so done in under 15 minutes).
It prints faster than the Wanhao.
It finishes the top of prints properly unlike
my Wanhao (I won't tar them all with the same brush, might just be my one that doesn't finish the tops).
It has a bed levelling sensor and much longer adjusting screws so there's more room for adjustment and the initial set up took about 10 minutes. For a newbie this would be a great help, the original adjustment on my Wanhao took a lot longer because I didn't know what tolerances I was actually looking for. It was nerve wracking.
It has a filament sensor so if you run out or have a jam it pauses the print. It will restart where it left off. The Wanhao has nothing like this.
It has a better frame with 8 bolts holding the print head perpendicular to the base. The Wanhao has 2 bolts and is notoriously difficult to keep squared. I settled for nearly square.
It has a better cooling fan that's aimed properly at the print head.
It has a colour touch screen instead of a dial controlled menu.
It doesn't have a separate control box or the awkward bloody cable that accompanies it.
I has a flashing blue LED underneath (I don't know why).
The version of CURA it comes with isn't as good as the one I have from the Wanhao but this is a personal preference, it works fine I just can't find some of the more advanced settings.
It doesn't have it's profile loaded into CURA which was surprising. I assumed it was the Wanhao with extras and that seems to be working fine.
All-in-all it cost £100 more but there are far more than a £100 worth of improvements over the Wanhao.
I plan to keep my Wanhao for a year until the warranty ends then pass it on. It's currently not working again with something disconnected on the motherboard nd it's such a pain to open it up I've left it. I'll sort it this weekend though (if I can).
Technical support for both machines from the vendor is excellent.
Here's some (by no means all) of the new stuff:
edit: not the ratmen, I bought them off eBay.