It came up on the SeeMe forum as a competitor to DSM2. I don't have any reason to switch (as long as their servers stay up) but thought it might be interesting to look at on a rainy day.
While it will open IGS and STEP files, it will only SAVE to its own proprietary format and STL. At least with DesignSpark you have a couple extra SAVE options... That said, Creo Elements has a MIRROR function, unlike DSM. :/