Very very few people buy Level D's - far too costly. Level B++ is about a third less and capable of achieving all that the FAA would require of the operator including the following 'credits':
Instrument approaches.
Night flying time.
NVD time.
In the future , various authorities will be affording direct credits for normal Day VFR regimes and flight time in the synthetic trainer.
[Currently this can only be achieved on Level D's].
In addition and as advertised beforehand, the sim will offer unparalleled training in bad weather and multi malfunction scenarios including but not limited to near catastrophic malfunction training.
Then there are all the human factors/CRM processes which can be practiced.
Bear in mind that major airlines train all their ab initio's on sims utilising up to 98% of their time on synthetic trainers before setting foot in the real McCoy.
DS (Dynamic simulators) are the future. Think of the savings one would make by removing each hour normally exercised on fleet a/c and flying it instead in the sim.
Level D, though - erm I think not.......
Remember the technology (and often, the money) is in the fidelity of the visuals and their Image generators, not the basic platform with its hydraulic electric jacks.