What hasn't been mentioned is that you won't have a dangly filter - the engineer will fit a rather bulky filtered faceplate
These filtered faceplates can produce an audible hiss on good quality phones. So you might need a dangly filter to eliminate it, as recently happened to me.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 15.6 Meg LLU => 2011: Orange 16.8 Meg Untweaked WBC