I recently put a Shurflo faucet in my Westy.  I've been wanting one
for quite a while.  I never have used the city water connection.  The
stock Westy faucet has these problems IMO:  water comes out at one
speed which almost all the time it too fast and in too powerful of a
stream.  If you try to use it directly, it splashes all over the
place and drains the tank too fast.  I took to keeping a plastic
drink cup in the sink to put water in and then used that to rinse
dishes, brush teeth, etc.  The knob is also hard to turn with wet
soapy hands.  I guess those are my complaints.

I had a saved search on ebay for a couple years that was always out
there looking for a bargain on a Shurflo for me and it finally found
me one.  There was a seller that apparently was going through new old
stock from an RV place.  I think I paid less than $25 including
shipping to my door.  There is a date on the unit I got that is in
the early 2000's, but it was definitely new.  I put it in using the
"door bumpers" method that someone on this list had pictures
of.  Pretty easy job.  The Shurflo swivels and pivots all over the
place like the stock faucet.  I think it might have  a little longer
"reach."  I think the best thing about the Shurflo is the adjustable
flow rate.  You can have just a trickle, and on full blast it seems
to put out quite a bit more than the original faucet.  The control is
easy to use, even with slippery hands.  This is definitely a
worthwhile upgrade in my opinion.

Edward