Anyone else groing this? It is by far the smallest and slowest grower
of all my S&W bare roots and I'd like to know if this is typical of it
or if I may have gotten a "challenged" plant.

Of the other "purples:"

Both Barbra Streisand and Blue Nile age when cut to a nice light
purple--no pink in it, not mauve at all, honestly a washed out shade
of purple too deep to be called lavender.

It has been interesting to watch these two side by side in a vase. The
appear nearly identical from bud to the nearly open stage, then as
they open Barbra really shines with more petals and a lovely
high-centered form that unfurls in a spiral. Blue Nile, while really
pretty, does not compare favorably. The most striking difference is in
what is commonly referred to as "substance." This morning Blue Nile's
petals were so floppy and sad I had to check to see if the stem was
getting any water. It was. Barbra Streisand's petals were still ...
well, "turgid" is the first word that comes to mind, though the tone
sounds all wrong.

Just as others have said, BS is apparently a really nice rose for
cutting. The bush is too young to really tell much about.