When I had my remap (R-Tech) they advised a DPF removal but not EGR valve. DPF was removed, cut in half, innards taken out, body re-welded back together, software delete.
Advantages: better MPG, engine breathes easier, more power, no £1500 to replace it when it wont regenerate, no worries about short journeys, no having to take it for a run up the motorway to do a regen.
Disadvantages: cost of removal (small compared to replacement) - I view it as pro-active maintenance.
One concern: there is talk of the DPF becoming part of the MOT, but as I understand it IF this ever happens it will only be a visual inspection to ascertain it is there. If you have it done like mine it would still pass. Removing it will not affect the emmissions tests.
Not an expert but I believe the above to be true.