I am located in SW Florida. Mainly dealing with St Augustine turf types. The original TAS Trimmer is the model I use the most. I average 75 donuts trimmed in 15 mins time. I touch up all heads once a month due to the year round growing season here. I can trim on average 1000 to 1200 donuts per TAS Trimmer. Cost $19.95, that would be for the 7" model. I find the videos posted on YouTube about this product very informative.