What theological teachings of Watchman Nee, Witness Lee, and the Local Churches differ from Reformed Theology

I recently moved and have been Church hunting (but this it not a question about Church advice) and attended a "Local Church." In this particular Church, service goes as follows: * first part: * everyone opens hymn book * people shout out numbers (corresponding to hymn #) * everyone sings the hymn together * second part: * church splits up into small groups * everyone opens up a booklet of Nee/Lee * people stand up and talk about how this week's readings effected them / their insights on the week's reading Now, this is different to me (since I used to attend churches where a single person would preach) -- but I don't see anything _unbiblical_ about their approach. So what I'm curious now are: * are there any _theological_ differences between Nee/Lee/Local church and reformed theology? Thanks!