MD80 FLT CREW IS CONCERNED WITH NOT COMPLYING WITH ALT XING RESTR DURING ARR INTO LAX.

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DURING OUR INITIAL DSCNT ON THE SADDE 6 ARR TO LAX; WE WERE ASKED TO SLOW TO 280 KTS (FROM 320 KTS). CTLR SPECIFIED TO GET TO THE SPD; THEN CONTINUE OUR DSCNT. WE WERE SLOWING QUICKLY AND CROSSED FILLMORE AT APPROX FL180; PUTTING US HIGH ON THE DSCNT TO MAKE A XING RESTR OF 12000 FT; 12 DME SE OF FILLMORE. WHEN WE WERE SWITCHED OVER TO SOCAL APCH; THE CTLR ASKED IF WE WERE DSNDING. OUR REPLY WAS YES; BUT AT 280 KTS AS INSTRUCTED (WE ALSO HAD FULL SPD BRAKES DEPLOYED). HE NOTED WE WOULDN'T MAKE THE RESTR AND OUR REPLY WAS THAT HE WAS CORRECT; CONSIDERING OUR SPD. HE THEN ACTED SURPRISED WE WERE NOT AT NORMAL SPD; RECLRED US AT NORMAL SPD AND WE CROSSED SYMON 1000 FT HIGH. THE PROB AROSE BY BEING GIVEN A SPD REDUCTION LATE IN THE DSCNT. ALSO; FREQ CONGESTION MADE IT HARD TO TRY TO GET THE RESTR WAVED; AS IS COMMON PRACTICE ON THAT ARR. THE PROB REALLY WASN'T DISCOVERED UNTIL HANDED OFF TO APCH. OUR CORRECTIVE WAS TO DSND AT NORMAL SPD; ONCE THE 'PROB' WAS DISCOVERED BY THE APCH CTLR. IN THE FUTURE; WE WILL COMMUNICATE THE POSSIBILITY OF A PROB WHEN GIVEN A SPD REDUCTION AND NOT ASSUME IT TO BE THE WAY IT USUALLY IS. THAT IS; XING THE WAYPOINT HIGH IS OK AS LONG AS THE PROPER SPD IS BEING FLOWN. ALSO; IT OFTEN SEEMS THAT CTR AND APCH ARE NOT COMMUNICATING WELL WITH EACH OTHER (NOT JUST IN LOS ANGELES BUT OTHER AREAS AS WELL) AS WE FIND OUR SPD ASSIGNMENTS BY CTR ARE A SURPRISE TO APCH CTL.