I haven't seen that product, so I don't know what exactly it is, but I wouldn't waste money buying anything like that. All you need is a bucket, a piece of airline a few feet long and an airline tap.
I simply put the new fish in the bucket with the bag water, put the airline with the tap on the end in the tank, open the tap, suck on the end to start a siphon, close the tap almost all the way so it's dripping about 1-2 drops a second and let it do it's own thing for a few hours. I also use airline suction caps to keep the airline in place under the water.
After the drip acclimation, I rebag the fish and temperature acclimate for about half an hour or so, then let him go