Ok - so to use this product it needs an update first - which takes up 26 gigs of space. So you are not getting a 128 gig card. You are getting about a 100 gig card.
Also - if you are unfamililar with the use of SD cards for the switch - it actually installs behind a rubber kickstand located on the back of the console. Easy enough to install once you figure out how to pry this open.
Would I recommend this product? Well, its a bit of false advertising in my mind as you are only getting about 100 gigs even though they advertise 128 gig.