Some will say learning to use the #45 is a prerequisite to using the #55. There is one #55 in my shop and four #45s that get used.

For most things one of the #45s is used. Recently a #50 was purchased. It is set up to do the 1/4" plow work like box and drawer bottoms.

For all but the complex shapes the #55 stays on the shelf. It is a bit fussier than the #45 to get working.

My advice is to purchase the #45 being offered if it is at a good price.

jtk