Can't speak for the others, but Zhu was my first Taiji master-level instructor (Jingwu Association, Malaysia, 1995-6)
Pros:
Zhu is a very nice man, and very open
Really nice set of 18 neigong (teaching expand compress, opening and closing) though as they were not explained to me at the time ("just do it") it took me years to work out what they were really for.
Lot's of silk reeling and form training.
Unlike many other Taiji styles, Chen has fajing training built into its curriculum - both in the forms and the weapons (notably, pole and spear).
He will show you the applications if you really want them.
Cons
Just a little bit of PH, mostly the set variants.
No fight training - no competitive tuisa or sansau - that I ever saw
No self-defense drilling or training that I ever saw
Zhu lives and teaches largely in Singapore, where there is little demand for combative material
In sum: If you want to learn a good IMA, Zhu has the material - hell, just watching him move is educational. But AFAIK, he does not teach much of anything that is fight-related.