I took a Z-Spray for a test run today. It was the intermediate model. I found the controls cumbersome compared the my Permagreen Magnums. I found it difficult to control the fertilizer on/off, turn, and maintain my speed all at the same time. For guys with both machines. What are your thoughts? Does it just take time and practice? If you have both machines can you do a 10 K lawn just as fast with a Z? I like the Z's capabilities but not sure about its handling?