if wsd bikes didn't exist, then my choice would be very limited. Though to be fair, it's not that big a choice as it is!

I'm 5ft 2" with 31" inside leg. I need a shorter top tube, and this is what wsd bikes cater for. My legs are 2" longer than those of my 6ft tall husband. If i sit on his 16" bike there is no way I can reach the handlebars. My 12 year old daughter is currently 4ft 10" with 30" inside leg - she's 'borrows' my juliana cl (borrows as in jooly is now refered to as 'her' bike!)

If you are over 5ft 5" then you have a big choice, most generic bikes will come in a frame size that can be tweaked with stem and seatpost layback to provide a good fit.

This is my experience anyway