[Elecraft] K2 Reception Improvement - DSP or AF filter?

[KBG Luxford]

Now that my K2 is on the air (CW only until I assemble the SSB adapter) 
I am thinking about some fruit salad.  The bands are pretty noisy at the 
moment - atmospheric, touch lamps, fluorescents, electrical storms et 
al.  Has anyone experience of both the K2 DSP and AF filter that could 
offer a comparison?

Many thanks and 73
Kevin
VK3DAP / ZL2DAP