Very satisfied with Pipercross so far: Not such a big fan of cotton filters (K&N, DNA) because they could let small dust particles pass through. Examples are easy to find here in the forum and on Google...
For road use it should not be a problem, but if you also take on dusty conditions, foam is the right material in my opinion.

Nevertheless, also take the time to take off both side covers of your airbox and seal them off with grease!