I bought a Gold Buddy - Large and use a Stihl blower, Finding the flexible hose was the real challenge. Ended up with 80mm lay flat irrigation hose and a 90 degree pvc elbow to get the air to the machine. This all folds down nice and flat when packing away but you need to make sure you get a straight line to the machine so not to restrict the airflow. A cable tie is used for the throttle control and works well. Two of us working in the heat and dust were not capable of keeping the material up to the machine. We would dig for 15 minutes, shovel and screen and then start the GB until the machine had processed all the diggings. Recovered enough gold to pay for the machine several times. Best effort was 10 grams in a day working solo. Wish every day could be like that. The worst thing is that the dirt gets shoveled three times, 1st into the buckets, then onto the machine and then away from the machine. Bets thing is how good a cold beer tastes at the end of the day.