CPR FLC IN A BEECH JET 400A EXPERIENCE AN NMAC ON A 4 MI FINAL TO OSU RWY 27L; A XING C172 AT THEIR ALT. THE C172 HAD GIVEN A POS RPT TO CONTRACT TWR; JUST PRIOR TO THE BE40'S ARRIVING AT THE 4 DME FINAL. AFTER THE TCASII RA AND EVASIVE ACTION; THE BE40 WAS CLRED TO LAND BUT CREW THEN NOTED AN SMA LNDG OPPOSITE DIRECTION ON RWY 9R. THE BE40 FLC WENT AROUND. FO CITES POOR CTLR PERCEPTION CREATING DANGEROUS SITS.

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WE WERE ON AN IFR FLT PLAN FROM PBI TO OSU; DEPARTING PBI AT XA00. WE WERE CLRED FOR A VISUAL APCH TO RWY 27L AT OSU BY OSU APCH CTL AND TOLD TO CONTACT THE OSU TWR. THE PNF SWITCHED TO OSU TWR FREQ AND RPTED 10 MI E OF THE ARPT FOR RWY 27L. OSU TWR TOLD US TO IDENT AND RPT A 4 MI FINAL. WE CONFIRMED. WHILE DSNDING OUT OF 2200 FT MSL; ABOUT 4 MI FROM THE RWY; WE RECEIVED A TA ON OUR TCASII. APPROX 4 SECONDS LATER WE RECEIVED A 'CLB; CLB; CLB' COMMAND FROM OUR TCASII. I IMMEDIATELY CLBED THE ACFT AND THE PNF SAW A C172 PASS APPROX 100 FT BELOW US. WE HAD HEARD THE CESSNA RPT HIS POS NE TO OSU TWR AND WERE AWARE THERE COULD BE A POSSIBLE CONFLICT. THE TWR WAS NOT SITUATIONALLY AWARE OF EITHER ACFT'S POS. WE RPTED A NEAR MISS TO THE TWR AND CONTINUED OUR APCH. WHILE AGAIN DSNDING TO THE RWY WE NOTICED A LOW WING ACFT LNDG ON RWY 9R AFTER WE WERE CLRED TO LAND ON RWY 27L. WE INITIATED A GAR; MADE L TFC AND LANDED ON RWY 27L. THE OSU TWR HAS RECENTLY SWITCHED FROM AN FAA TWR TO A CONTRACT TWR. I FEEL THEY HAVE NOT BEEN PREPARED FULLY TO HANDLE THE MULTIPLICITY OF OSU'S TFC. I HAVE SPOKEN WITH/OVERHEARD OTHER PLTS ON THE FIELD AND MOST FEEL THAT THE 'NEW' TWR HAS JEOPARDIZED SAFETY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR FO IS QUITE EXPERIENCED IN THE OSU AREA AND ARPT. HAVING GRADUATED FROM OSU AND WORKING THERE FOR 6 YRS AS AN INSTRUCTOR PLT; HE KNOWS THAT FACILITY'S OPS EXTREMELY WELL. HE STATED THAT THIS PAST SUMMER THE TWR WENT TO A CONTRACTED TWR STATUS. HE DOES NOT KNOW THE MANAGING COMPANY OR THE MGRS BY NAME. HE DID MEET THE CTLRS AFTER SAID INCIDENT TOOK PLACE. HE LIVES NEAR THE ARPT AND CAN WATCH TFC FROM HIS HOME. HE HAS SEEN 'MANY' STRANGE OCCURRENCES LATELY; THOSE OF NEAR MISSES; ACFT TRYING TO AVOID EACH OTHER. GENERALLY; AS HE SAYS; 'BEDLAM.' HE WAS NOT IMPRESSED WITH THE DEMEANOR OR ATTITUDE OF THE CTLRS HE SPOKE WITH. THEY WERE VERY UNPROFESSIONAL AND WERE MAKING WHAT HE TERMED AS 'LAME' EXCUSES FOR THE 2 INCIDENTS THAT AFFECTED HIS FLT. IN SPEAKING WITH OTHER PLTS FLYING IN AND OUT OF OSU; HE FOUND THAT ALL THE OTHERS AGREED WITH HIM ON THE SAD SIT IN AIR TFC CTL AT OSU. SEEMS THERE IS NO ONE IN CHARGE; WITH THE TWR CTLR'S PERFORMANCE INDICATING A LACK OF PROFICIENCY. HE WOULD REALLY LIKE TO SEE SOME CONTACT WITH MANAGERIAL STAFF; WHOEVER THAT MIGHT BE; AND EFFECTIVE TRAINING INSTITUTED.