varchar(max) and FTS

Hi,
I have a made a full text index on column in a table having only 2 cols in all(one phrase(varchar(4000)) and second Id).
Now i want to change that col to varchar(max).
Query 1: How will it affect my FTS(if at all it'll affect)?
Query 2: Any drawbacks of using varchar(max) cols apart from that it stores the data off-row incase the row size goes beyond 8060 bytes?