These are probably fine for most browsers in 2005. But here is why I don't use them:
Some years ago, we created a web site for the @Home corporation (later known as Excite@Home). We used progressive jpegs, reviewed the site using multiple browsers and platforms, etc. Everything was fine. We send the entire site to them, they uploaded and launched it. It turns out that the @Home browser, which was a variant of IE, CRASHED every time it tried to view a page with a progressive jpeg. Which of course, was every single page.
I had the joyous task of re-saving every single jpg graphic on the site. And ever since, I don't use them.
I don't know if they will crash any browsers in 2005. But I know that regular baseline jpegs will not, so that is what I use. Maybe I'm just overly cautious, but re-saving graphics is tedious work.