I finally did it. I've been putting off this purchase for about a year and finally it got to the point where I was wasting enough substrate to contamination I had to buckle down and purchase this sealer. I used it for the first time this morning. The manual pedal helps ease a lot of back pain by the end of the sealing session. Every seal was perfect on the first go. I didn't have to re-seal one bag. Tons of time saved. Worth spending the money on if sealing is a big part of your business. I'm a mushroom grower. This is going to save me tons of money in the long run.