Daz -
for what it's worth i changed over to fan jets a couple of months ago and will never go back to pencil jets
Fans are quicker to rinse with cover the glass better and really shift the crud in the corners.
personally have not had any trouble with water spraying all over the place - just on the glass and frames as it should be.
i reckon to have saved upto 3/4 hr per day from when using pencil jets.
Darran