Funny how we are all different. I much prefer the 12 or 14 inch blade regardless of the size of the window. I do loads of shop fronts with large panes and find the smaller blade easily twists and turns and goes backward and forward, up and down, any which way you want with ease. It's when you make a small mistake and have to go over that part again that I prefer the small blade, the larger ones are more cumbersome and take more time to rectify any mistakes .If the air is moist, the squeegee works best of all and even I don't make many mistakes, but on a dry hot day, well we all know what the glass can be like to work on on those days.

I've used a 16 inch years ago when i had a round in a different area.Like you i always preferred the smaller type but i really like this one.Took a couple of days to get used to it but it really is so much quicker. It's great being able to cut through the soap in a couple of strokes. I'm planning to dog ear it as well to speed up even more. I also carry a 12 inch ony belt for the smaller windows.

 i was  using a  16 " unger  in the beginning.. then went to a sörbo 18 "..   was  using the sörbo 22 "   for  biggish glass...  just  recieved a  sörbo 20 "  ( 50 cm )   and for  my  windows  its  fantastic....  i  cut in up the left side and then go across the top of the window and  do a fairly  long down stroke  then and  back to the other side..  just eats  up the glass....  i cant understand  someone using a small squueggee   for  big glass..... but i respect that...  and each to there own.. but  if any of you out there are confronted  with big glass on a regular basis  i would highly recommend  getting  the Sörbo  20 " ( 50 cm )  of all the sörbos  i have  from  very small right up to  90 cm  .. i  find  the  20 "  is  the work horse and great  for hand squeegeeing..   a  22"  is  good  but slightly  too big  and a  18 "  is  obviously  good  but  i  always  felt i could  step up a little  more.and regardless  of what people say  a  big sörbo  washer applicator on a pole is  also  very  good   i use a  75 cm     and  always  have a water bottle  handy  when  using that.. i said on another  post i dont use  a  water bottle  much  its  only very recently  that i have been using this technique.. and yes  when  walking and squeeeging around  many  windows  the  water bottle is  great.
 like i said  use the sörbos  big guns  if  you have big glass.. but for  the normal  english houses  i guess a  16 "  or  14 "  is about right.. ??

I use a 12 " for the same reason as you guys.

i dont know what the lenght of mine is but it does the job   

On big shop windows I always use my Sorbo 30". It really fast especially with a pole.

A Spanish window cleaner working on a shop window near the one I was doing in the local moll did actually come over to me to look at my 'muy grande' tool  

Normally use an 18" - have a few over 30"

You buy 100 foot rolls. But yep your right - no fun when they go.

Once a year I thought I was doing well once a month.