I bought the Heimplanet Fistral tent and somehow lost the adapter, so this pump was necessary for my $400 investment to not be a waste. You can only inflate the tent about 50-60% with your breath (non-smoker), which makes for an uncomfortable night when you drive hours from home with said tent.
If you want to look competent at camping with your Fistral, make sure you've got this.
Only negative: it takes many more pumps than advertised to get full inflation.
This review was written in the old system and had content requirements that are different than reviews written today.