The only issue I see with that linked flashlight is its a double 18650 light. That would be rather long and not fit in a pocket very well. Something with one 18650 is ideal imo for a useful light (the one I carry everyday is that size as are most "every day carry" EDC lights. Very easy to find a holster for or carry in a pocket. Something like this linked one is the size I would prefer and though the lumens are bit less it is a very bright and useful light. Plus this is a very popular proven light with all items included.
https://www.amazon.ca/Flashlight-Poc...2&sr=8-32&th=1The linke offering is very cheap for 2 lights and 4 batteries, you may want to pay a little more if it's something that is going to be your main light.
I find I like to have a few different lights in different sizes really small (14500 battery) to EDC's (18650 battery) and then a few bigger powerful ones (multi 18650 or 26650). I keep them stashed in different areas (truck, night stand, front hall) and when it's deer season I pack a headlight and a powerful search light. Most chargers will handle a variety of battery sizes and are very reasonable in price as are batteries now a days. It makes it easy to swap batteries around to specific lights or simply buy a few extra if you find a good deal.
Good luck with whatever you pick.