I'm using bullet library in Modo 601/701.

From this experience, this library is not good enough for

softbody/cloth simulation things.

Sure, it works almost perfect for solid surface, rigid body.

Such as stuffing candy balls in bottle.

But its cloth simulation is awesome, strange folding, easily stopping by error,

and it has not enough parameters for control whole simulation.

In my opinion, Poser's cloth room is far better.

Currently I usually make cloth in poser , and export it to Modo.

So I do not expect much.

But introducing dynamic things in poser is good progress for the program.