I don't know the other version so I can't tell you if it's better or not; but the one I rated is really good, it's the one I am using currently and it's awesome.
This was the first macro lens I ever bought, it was matched with my trusty old Canon 30D which was the camera that I first learned photography on. I still use both the camera and the lenses from time to time. Obviously my experience with the lens will vary with a camera that's 14+ years old but I found it to be a very good, sharp lens with a sturdy build.
I personally had very few instances where i needed IS with it as i prefer to either use flash or previously LED lights to light my subject. I also did not get to try things such as extension tubes with this lens, where I may felt the need for IS much more. Overall, this for me was a great lens to learn some macro concepts. I only wish I could have experienced it with a newer camera body to see its full potential. I've since upgraded to newer camera and lenses from another manufacturer