Installed about a month ago. Have to say it works pretty well. Throttle response much sharper and mid-range pull is stronger, for both normal and wide-open-throttle. Overall, the engine breathes much easier & smoother.
I was actually only going for a drop-in filter, but later noticed the stock air-box has too small an airflow surface area to the engine. If you remove the stock air-box lid, you'd see that after the filter the air flows through such a tiny and thin area within the lid.
The other thing I noticed after a month is fuel consumption improved. Was getting 6-7km/ltr initially, now about 8-9km/ltr.