Great aircraft but not the best machine for passengers (ride quality). Not unusable though.
The BO-105CBS (DBS in the UK) is the only way to go as (mentioned before), it is slightly longer fuselage. It allows you to reverse the co-pilot seat to face rearwards so the doctor/paramedic can sit at the head of the patient.
For considerably more grunt, the BO-105LS is the business. It has the longer fuselage (like the CBS/DBS) but is equipped with two C28 engines giving approx. 550SHP per engine as opposed to 450SHP for the CBS.
The BO-105 shares the same rotor head as the BK117 but they don't require much maintenance anyway.
I love them!