The battery makes a big difference - will now go for nearly two days. The case could be a better fit. It doesn't close neatly all the way round. It fatter and heavier than the original set up but that's to be expected and i prefer the thickness to be along the whole body of the phone rather than just around the battery as on other similar battery extended offers.
Only used it a couple of times so far. It gives a good amount of heat and can be a bit tricky to get lit and it hasnt lasted long enough but that was covered in the instructions. Hoping for better performance as it gets more use