Jrmikka...We have no regrets making the jump to a bigger machine. We had definitely outgrown our other one. I don't have a formula for when it is the right time to make the step up to a bigger machine...I think you'll just know. 750 gallon is a reasonable sized machine...you should be able to utilize that for quite some time. We did around 50-60 acres of hydroseed this year if I had to guess. I'd have to go back & do some research to come up with an exact number. That's not very much compared to the big guys...but it's definitely good for us! We are trying to increase that year by year. Here are a few pics from a job we did this year. We had the machine floating out on a barge shooting all of the river banks.