Just happened to find this forum post from David Sims, which is in reply to someone asking why they’d use TopStyle when they already have Dreamweaver MX:

"I like DWMX2004, and it’s a vast improvement over MX, but nothing comes close to TopStyle for stylesheets. I’ve built and now manage a 4,000-page site using only TopStyle to create and manage the styles – I simply couldn’t do it with MX or MX2004 with as much ease or speed as I’m able to with TopStyle."

Read the entire post here.