I recently invested in a Bullmaster pump from Pumptoys. This vid is after removing it after 3 sets of 30 minutes worth of pumping. This was the first time I've tried pumping my balls, and certainly won't be the last. The feeling of pulling the pump off alone felt wonderful, but the added heaviness of my giant inflated sack dangling below was almost addicting. They stayed inflated for over 8 hours, and you can believe I spent the whole time edging away.