"The most important thing to consider when purchasing this product is the price," Wrong.
The most important thing to consider when buying batteries for cameras is whether they will work a camera when you need them to and for a reasonable amount of time. The 'saving' can - and most likely will - come back and bite you if the battery turns out to be sub-standard, as most of these 3rd party batts are.
I am looking around the 3rd-party battery suppliers for one that I think will get somewhere near the original Nikon performance. There is just one - Uniross. This is a major battery manufacturer, from deaf-aid buttons to vehicle batts. As a battery manufacturer, they have cred.
If your Ex-Pro lasts as long as a Nikon, you have done well. My experience with two 3rd-party batts for a Canon is that they are now dead, at half the age of the original Canon batt, which is still delivering full power and taking a full charge.
I note that Ex-Pro is an own-label outfit that sells all sorts of stuff. They buy batts from whoever and stick a label on them. Note that at the price they are charging, imagine what they buy them in for - peanuts. Well, who wants to be a monkey?
The saving on these 3rd-party batteries seems too good to be true. My own and many others' experience is that it is indeed too good to be true. The fact that this supplier is offering a 2 year warranty is encouraging but not convincing, in my view. What use a warranty when you're holding a dead camera?