You need an outlet at the back for the thrust/hot air etc etc to appear with fanjet,hence if you put one on a TBM700 you would end up with a bloody large pipe running through the cabin!
The main reason for not using props on larger a/c is down to the fact that above 400 kts or so the tips of blades will be almost going supersonic and cause drag that will in turn limit max speed.(I think). Fanjets don't have this problem.
(this is rough science by the way,if any nerds want to post a more in depth explanation feel free
)
P.s I love TBM700's if I won the lottery I would buy one tommorow.
