Probably a bit late I know, but being an avid cyclist who works for Raleigh I suppose I better contribute lol
The 400 is one of our most popular road bikes, becasue it offers such good value. The frameset isn't cheap however. The 100 and 200 models use a cheaper tubeset, to help keep the cost down, but the 300 and the 400 both use the double butted tubeset, which is 6061 grade ali. If you contact Shiny on here (usually seen lurking in the westbridgford forum) he rides a 400, so could probably give you a more realistic review (mine will always be slightly biased lol).
All this is probably useless though as you may have bought one now
Just remember, whatever you do, don't ever shave your legs
