Sintered laps will cut just as aggressively on the first facet as the last. If you haven't used sintered faceting laps before, we recommend you order one grit size larger for sintered diamond tools as compared to plated or brazed parts.Standard diamond laps have a 5mm thin layer of diamond, usually electroplated in place with nickel plating. With use, the plated thin layer breaks down and starts cutting like a finer grit.  Sintered diamond faceting laps, on the other hand, have a very thick (5mm) cutting matrix. This contributes to a much longer life and steady, aggressive cutting performance.
For many, a sintered lap can provide a lifetime of steady, reliable performance. At a cost only 3-4 times higher than the bonded variety.