Gary.
Good question , earnings wise I would say better with up to 300 sq mtr per hour capability, not bad even at £1.00 per mtre.
Not having used d/f myself i cannot give an honest asessmet , how ever i do know that encap results are superb and instant with the added benifit of continual protection . and all of my commercial customers like the benifits.
Infact i,m just about to start a push for more commercial, had a load of brochure style leaflets printed aimed purly at commercial and encapsulation system, I will be visiting personaly premesis ,brochure in hand offering free demo if required .
geoff