Just saying, IPB's software came out BEFORE VB4.

Good article though, to add from IPBs point of view, most of the time if it's going to break your forums the ACP will warn you first. But it's still possible to screw it up. THe IPB CMS requires you to have some coding knowledge they even tell you this prior to purchase, to get it to work. But it offers a wider array of capabilities. The VB4 cms is nice but sort of limited with what you can do. Pretty easy to use though.
They do include a free portal with IPB that pulls data and is fairly pleasant on the eyes. Which is an alternative to IP. Content.