I had the Pro 4 Lite for one season and had to clean the carburetor due to residual oil from manufacturer. It had a tendency to bog down at full throttle while drilling and if I didn't let up on the throttle or lift it up it would stall. However, after I wiped it down I didn't test it by actually drilling any holes, but seemed to run better since I could reproduce the bogging down without cutting any ice.
I also wanted a 10", so I sold it on Craigslist and bought the Eskimo HC40.